School of Medicine
Showing 1-82 of 82 Results
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Aijaz Ahmed, MD
Professor of Medicine (Gastroenterology and Hepatology)
BioDr. Ahmed is an internationally recognized hepatologist with expertise in the treatment of acute and chronic liver diseases. He is a board-certified specialist in gastroenterology and hepatology, transplant hepatology, and obesity medicine. Currently, he serves as the Medical Director of the Adult Liver Transplant Program at Stanford University.
Dr. Ahmed graduated from Dow Medical College, Karachi, Pakistan. He completed his residency training in Internal Medicine at Brown University, Providence, RI and fellowship training in Gastroenterology and Hepatology at Stanford University. During his fellowship, he focused on clinical and research training in General and Transplant Hepatology.
For patients under his care, Dr. Ahmed remains dedicated to creating a personalized, comprehensive, and above-all a compassionate treatment plan. He outlines the diagnostic and follow-up management pathway in an individualized fashion; he updates his patients and their family/support at each step of the decision-making process; and he focuses on prioritizing the wishes of his patients and their family/support for an optimal outcome and quality of life.
Dr. Ahmed remains clinically active and has been instrumental in establishing a wide network of hepatology outreach clinics in remote and underserved regions of California and Nevada.
In addition to his patient care responsibilities, Dr. Ahmed remains committed to the educational mission of Stanford ford University. He remains deeply interested in mentoring trainees and students al levels from undergraduates to trainee physicians and junior colleagues. Dr. Ahmed has received several teaching awards during his career.
Dr. Ahmed’s research interests include 1) multidisciplinary approach to nonalcoholic fatty liver disease (NAFLD), 2) disparities in the management of chronic liver disease, 3) improving screening and management of hepatocellular carcinoma (HCC), and 4) outcomes research in NAFLD, HCC, viral hepatitis, alcoholic liver disease, and liver transplantation. He heads a busy and productive outcomes research team. In addition, he collaborates with basic scientists and is participating in several translational research projects at Stanford University.
He has published his findings in textbooks, abstracts, case reports, and high- profile medical journals including Gastroenterology, Journal of Hepatology, Hepatology American Journal of Gastroenterology, and other well-renowned peer-reviewed publications.
Dr. Ahmed and his team has made presentations to his peers at many national and international conferences: the American Association for the Study of Liver Disease, International Liver Congress, European Association for the Study of the Liver, Asian Pacific Association for the Study of the Liver, and more. His presentations have addressed leading-edge approaches to the treatment of chronic liver disease, liver cancer, and liver failure. He also has presented his insights into the gastrointestinal impact of COVID-19.
For his clinical, research, and teaching achievements, Dr. Ahmed has earned extensive recognition. His honors include being named as one of America’s Top Physicians by the Consumers’ Research Council of America.
He is an active member of the American Gastroenterological Association and the American Association for the Study of Liver Diseases. -
Subhas Banerjee
Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsDr. Banerjee is the Director of Endoscopy at the Stanford University Medical Center. His research interests include evaluation of advanced endoscopic procedures (ERCP, choledochoscopy and endoscopic ultrasound) in the diagnosis and management of benign and malignant pancreatic and biliary disease. Additional interests include the development of new endoscopic devices and instruments.
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Grant Barber
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Grant Barber is a Clinical Assistant Professor at Stanford University. His clinical passion is in the care of patients suffering from inflammatory bowel disease (IBD), including Crohn's disease and ulcerative colitis. After completing his medical training at Harvard Medical School, he completed his training in gastroenterology as well as a Master's degree in clinical research at Stanford. He completed additional training in advanced IBD management at Stanford before joining faculty. His research is focused on male reproductive health in IBD, quality improvement in the provision of IBD care, and economic studies to identify strategies that provide excellent outcomes while being sustainable within the healthcare system. He is an expert in tailoring evidence-based therapies to need of individual people with IBD.
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Laren Becker
Assistant Professor of Medicine (Gastroenterology)
BioI am a physician-scientist in the Division of Gastroenterology at Stanford University. My clinical and research interest has been in neurogastroenterology. Specifically, my research has been exploring the interplay between immune cells and the enteric nervous system, and evaluating how perturbations of this interaction as a result of aging disrupts gastrointestinal neuromuscular function. Ultimately, my hope is that insights from this research provide novel therapies for treating patients with motility disorders like constipation and irritable bowel syndrome.
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Chris Cartwright, MD
Professor of Medicine (Gastroenterology and Hepatology), Emerita
Current Research and Scholarly InterestsMolecular mechanisms of intestinal cell growth control; function and regulation of the Src family of tyrosine kinases in normal cells, and their deregulation in cancer cells.
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Ramsey Cheung
Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsDr. Cheung's research interests focus on liver diseases, with emphasis on viral hepatitis. His past research include investigating the mechanism of viral neutralization of hepatitis B virus at the molecular level and immune response to hepatitis C virus. Dr. Cheung is studing various aspects of hepatitis C, both clinical and translational research.
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Antonios Chronopoulos
Instructor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsMy research focuses on understanding how extracellular matrix (ECM) remodeling in liver fibrosis, particularly in the context of aging, diabetes, and metabolic-associated steatohepatitis (MASH), disrupts tissue mechanical homeostasis and drives hepatocellular carcinoma pathogenesis. The goal is to translate these mechanobiological insights into novel therapies targeting mechanotransduction to prevent or reverse fibrosis and improve patient outcomes with liver cancer and other desmoplastic tumors
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John Clarke
Clinical Professor, Medicine - Gastroenterology & Hepatology
BioDr. John Clarke recently joined the Gastroenterology & Hepatology Division at Stanford University as Director of the Esophageal Program. He previously spent 17 years in Baltimore, including 9 years on the faculty at Johns Hopkins University where he was an Associate Professor and at various times Director of Esophageal Motility, Director of Gastrointestinal Motility, Clinical Director of the Johns Hopkins Center for Neurogastroenterology, and Clinical Director of the Gastroenterology & Hepatology Division at Johns Hopkins Bayview Medical Center.
His career has combined research, education and clinical care. His clinical areas of expertise include achalasia, dysphagia, eosinophilic esophagitis, esophageal dysmotility, gastroesophageal reflux disease, gastroparesis, GI-manifestations of scleroderma and GI dysmotility. While at Johns Hopkins University, he was inducted into The Miller-Coulson Academy for Clinical Excellence, an institutional honor society for master clinicians at the time limited to 50 members across the entire university.
From an education standpoint, he has lectured in over a dozen countries, authored over 25 textbook chapters and serves on the educational affairs committee of the American College of Gastroenterology. He has also won several major teaching awards, including The Johns Hopkins University Alumni Association Award for Excellence in Teaching, given to one faculty member per year in the entire School of Medicine.
His research has focused on optimization and characterization of diagnostic studies to evaluate motility disorders, as well the relationship between therapeutic endoscopic techniques and treatment of motility disorders. He was an investigator on the NIH Gastroparesis Consortium and is also a former recipient of the AGA Don Castell Award. -
Meredith Craven, PhD, MPH
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsDr. Craven’s research reflects her background and interests in psychogastroenterology (GI psychology), public health, and positive psychology. She has collaborated on projects across the spectrum of GI disorders, using quantitative and qualitative methods. She is interested in the role of biopsychosocial factors on symptom perception, experience, and related health outcomes and behaviors. In particular, she is passionate about investigating the role of patient strengths that can be fostered clinically, and mind-body practices.
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Tami Daugherty
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsDr. Daugherty is a transplant Hepatologist with full-time clinical responsibilities. She is particularly interested in the natural course and management of recurrent Hepatitis C after liver transplant, and the effect of immunosuppression on HCV recurrence.
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Renumathy Dhanasekaran
Assistant Professor of Medicine (Gastroenterology)
Current Research and Scholarly InterestsThe overall goal of my research is to understand the molecular pathogenesis of liver cancer and identify biologically relevant prognostic biomarkers and molecular targets for therapy in patients with hepatocellular carcinoma (HCC). My long-term objective is to improve the clinical outcome of patients with liver cancer.
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Nikki Duong, MD
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsMy research interests focus on quality improvement and patient reported outcomes in people with cirrhosis. I also have interests in expanding our breadth of knowledge in caring for patients with gastrointestinal and liver disorders who identify as a sexual and gender minority.
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Chiazotam Ekekezie
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioPrior to Stanford, Dr Ekekezie completed internal medicine training and chief residency at Brown University. She moved to Stanford for GI and hepatology fellowship, and served as a chief fellow in her final year. After fellowship, she stayed on joining as a Clinical Assistant Professor and Associate Program Director for the GI fellowship program. She has presented nationally and internationally on topics related to medical education, psychological safety, and inclusion.
Clinically, Dr Ekekezie welcomes seeing patients with a diverse range of GI-related issues as part of Stanford’s general GI group. She is dedicated to advancing a career in academic medicine that is balanced on her “core-four” pillars: humanism-centered patient care, community-engaged advocacy, service-oriented leadership, and mentoring the next generation of clinicians. She has received numerous awards for excellence in patient care, professionalism, communication, and collaborative consultation, as well as for her skills as an effective leader, mentor, and educator. -
Samer Eldika
Clinical Professor, Medicine - Gastroenterology & Hepatology
BioDr. Eldika received his medical education at the American University of Beirut. He completed his General Gastroenterology Fellowship at the State University of New York in Buffalo and Advanced Endoscopy Fellowship at the University of Virginia. At Ohio State University, he served as the Director of Interventional Endoscopy and Endoscopic Quality. His time at Ohio State University contributed to the growth and maturity of his experience and skills in interventional endoscopy. During his tenure there, he played a major role in building the program of interventional endoscopy in general, as well as interventional endoscopy for the pediatric age group, and the endoscopic quality program. Over the years, he was involved in training several gastroenterology fellows and interventional endoscopists. He recently joined Stanford University where he continues to practice interventional endoscopy and train fellows.
He is a board-certified Gastroenterologist with clinical interests in pancreaticobiliary diseases, gastrointestinal neoplasia, and related interventional endoscopic procedures. As an endoscopist, he has extensive experience in performing a variety of interventional endoscopic procedures. These procedures include endoscopic ultrasound (EUS)-guided procedures like fine needle aspiration/biopsy, injections, fiducial placement, pseudocyst drainage/necrosectomy, biliary drainage, gastrojejunostomy, transgastric ERCP, and needle-based confocal endomicroscopy for the evaluation of pancreatic cystic lesions. He also performs endoscopic retrograde cholangiopancreatography (ERCP), endoscopic mucosal resection, enteral and stenting, enteral feeding tube placement, as well as deep enteroscopy.
His research interest evolves around interventional endoscopy, more specifically in the evaluation of pancreatic cystic lesions. Dr. Eldika has received multiple awards in his career, his most recent one being the “Reviewer Award, April 2020,” for his superior contributions to the journal of Gastrointestinal Endoscopy, both through completing high numbers of reviews and for submitting the highest quality of work.
Dr. Eldika is a fellow of the American Society of Gastrointestinal Endoscopy. He is a member of the American Gastroenterological Association, American College of Gastroenterology, and American Pancreatic Association.
When not working Dr. Eldika enjoys reading, listening to music, watching sports and walking in nature. -
Nielsen Fernandez-Becker
Clinical Professor, Medicine - Gastroenterology & Hepatology
BioI am the director of the Celiac Disease Program at Stanford and I am highly experienced in diagnosis and management of celiac disease and gluten associated disorders.
My objective is to provide excellent and compassionate clinical care for my patients while seeking a better understanding of diseases I treat, particularly Celiac disease (CeD), eosinophilic esophagitis (EoE). My top priorities are patient care and translational research to make new discoveries and improve the care my patients. -
Shai Friedland
Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly Interests1. Gastrointestinal Endoscopy- Techniques and Outcomes
2. Noninvasive colorectal cancer screening
3. Medical device development in gastroenterology -
Gabriel Garcia, MD
Professor of Medicine (Gastroenterology and Hepatology) at the Stanford University Medical Center, Emeritus
Current Research and Scholarly InterestsThe natural history of common viral liver diseases of man is poorly understood, despite the fact that chronic liver diseases of man may result in death from liver failure or hepatocellular carcinoma.
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Patricia Garcia
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioPatricia Garcia, MD is a board certified gastroenterologist and clinical informaticist. She is fellowship trained in neurogastroenterology and specializes in treating disorders of gastrointestinal motility including trouble swallowing, heartburn, reflux, constipation, fecal incontinence and pelvic floor dysfunction. She is also passionate about using digital health technologies and artificial intelligence to improve clinician and care team burden and burnout.
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Jeffrey S. Glenn, M.D., Ph.D.
Joseph D. Grant Professor and Professor of Microbiology and Immunology
Current Research and Scholarly InterestsDr. Glenn's primary interest is in molecular virology, with a strong emphasis on translating this knowledge into novel antiviral therapies. Other interests include exploitation of hepatic stem cells, engineered human liver tissues, liver cancer, and new biodefense antiviral strategies.
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Aparna Goel
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsDr. Goel is interested in studying the complications and management of patients with end-stage liver disease, including infections, bleeding and encephalopathy. As the waitlist for liver transplantation continues to grow, many patients develop consequences of decompensated liver disease. It is becoming increasingly important to improve our understanding and care of these complications in order to optimize the quality of life for this growing population of patients.
She is also particularly interested in the management of patients with autoimmune liver disease including autoimmune hepatitis, primary biliary cholangitis, primary sclerosing cholangitis among others. -
David Edward Goldenberg
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr Goldenberg completed training at UCLA, Geisel School of Medicine at Dartmouth, Tufts Medical Center, and Cedars Sinai Medical Center. In addition to a gastroenterology fellowship, he graduated with a Masters in Healthcare Delivery Science at Cedars Sinai Medical Center. He has a passion for medical education and enjoys teaching medical students, residents, and fellows as a Clinician Educator. His research focuses on Healthcare Delivery with an emphasis on maximizing value-based healthcare and medical innovation. He has an additional interest in translational research with multiple publications and patent applications for medical devices. He has unique clinical expertise in fecal microbiota transplantation.
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Harry B Greenberg
Joseph D. Grant Professor in the School of Medicine, Emeritus
Current Research and Scholarly InterestsMolecular mechanisms of pathogenesis; determinants of protective immunity; host range and tissue tropism in liver and GI tract pathogenic viruses and studies of vaccines in people.
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Damanpreet Grewal
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioBeing from Bay Area, I enjoy providing medical care to patients in northern California. I am excited to be part of the wonderful team of gastroenterologists at Stanford University Medical Center with its multi-disciplinary approach to caring for patients in an integrated healthcare system. I am dedicated to providing high-quality care to my patients while getting to know their personal beliefs so as to involve them in the decision-making process. Based on my education and training, I practice general gastroenterology in addition to performing endoscopies and colonoscopies.
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John Mark Gubatan, MD
Instructor, Medicine - Gastroenterology & Hepatology
BioDr. Gubatan is a physician scientist, board-certified gastroenterologist, and instructor of medicine at Stanford University School of Medicine. He earned his medical degree from Harvard Medical School and completed his internship and residency in internal medicine at Harvard's Beth Israel Deaconess Medical Center. He completed his gastroenterology fellowship at Stanford where he served as chief fellow and was an American Gastroenterological Association (AGA) editorial fellow for Gastroenterology. Dr. Gubatan’s research is focused on translational studies using single-cell multi-omics to understand mechanisms of therapy failure, elucidate the role of host immune and gut microbiome interactions in the pathogenesis of inflammatory bowel disease (IBD), and develop precision medicine strategies to improve outcomes in patients with IBD. Dr. Gubatan’s work has been featured in Gastroenterology, Gut, American Journal of Gastroenterology, Clinical Gastroenterology and Hepatology, Alimentary Pharmacology and Therapeutics, Journal of Crohns & Colitis, and Inflammatory Bowel Diseases. Dr. Gubatan's research and career development has been supported by a Chan Zuckerberg Biohub Physician Scientist Scholar Award, a Stanford Translational Research and Applied Medicine (TRAM) Scholar Award, an NIH NIDDK LRP Award, and a Doris Duke Charitable Foundation Physician Scientist Fellowship Award.
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Edith Ho
Clinical Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsDr. Ho plays an active role in the American College of Gastroenterology (ACG) Educational Affairs committee, where she chairs several abstract committees, directs regional post-graduate courses, regularly reviews physician course content, and develops CME content for the American Journal of Gastroenterology. She is also involed in the ACG Research Committee, which plays a criticol role in setting the direction of scientific advancement, education, and distribution of grant funding. Dr. Ho has also served as a guideline author for the American Gastroenterological Association on endoscopic therapies for weight loss and the medical management of luminal and perianal Crohn's disease. These guidelines shed new knowledge and set new standards of care for clinical practice here and abroad.
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Robert Huang
Assistant Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsEpidemiology
Epidemiology of gastric cancer
Racial and ethnic disparities in gastric cancer
Gastric intestinal metaplasia and other precancerous lesions
Molecular marker development
Microbiome -
Joo Ha Hwang, MD, PhD
Professor of Medicine (Gastroenterology and Hepatology) and, by courtesy, of Surgery
Current Research and Scholarly InterestsSpecialize in early detection of gastrointestinal malignancies including esophageal, gastric, pancreatic, bile duct & colon cancers. I have both a clinical & research interest in improving the early detection of gastric cancer in particular. I am the PI of the Gastric Precancerous conditions Study, a prospective study of patients with gastric intestinal metaplasia & other precancerous conditions which combines comprehensive clinical & endoscopic data with a large bio-specimen repository.
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Sajid Jalil
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioDr. Jalil is a board-certified, fellowship-trained transplant hepatologist (liver doctor) and gastroenterologist at the Stanford Health Care Digestive Health Center in San Jose, California. He is also a clinical associate professor in the Department of Medicine, Division of Gastroenterology and Hepatology, at Stanford University School of Medicine.
Dr. Jalil has extensive experience helping patients with a range of liver- and digestion-related conditions. He specializes in liver transplantation, and his other clinical interests include all forms of hepatitis, cirrhosis of the liver, fatty liver disease, polycystic liver disease, and primary sclerosing cholangitis (swelling and scarring of the bile ducts). He has also volunteered in initiatives to offer free colonoscopy and hepatitis B screenings to underserved ethnic populations.
His research interests include improving mental health by enhancing treatment access for patients with alcohol use disorder causing alcoholic liver disease. He has also studied swallowing problems, liver disease in pregnancy, living liver donation, and the use of artificial intelligence in treating nonalcoholic fatty liver disease and viral hepatitis. In addition, Dr. Jalil wrote a chapter on bile secretion and cholestasis (diminished bile flow) for the fifth edition of Yamada’s Textbook of Gastroenterology.
Dr. Jalil has published in numerous peer-reviewed journals, including World Journal of Hepatology, Liver Transplantation, and the Journal of Clinical Gastroenterology. Additionally, he has served as a reviewer for Pancreatology and as an abstract reviewer for the American Gastroenterological Association (AGA) and the Ohio Chapter of the American College of Physicians. He has presented his research at meetings and conferences worldwide on a range of topics, including the timing of pregnancy after liver transplantation.
Dr. Jalil is an AGA fellow and a member of the American Association for the Study of Liver Diseases, American College of Gastroenterology, and American Society for Gastrointestinal Endoscopy. -
Afrin N. Kamal, MD MS
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioAfrin Kamal is a board-certified gastroenterologist, who trained at Washington University in internal medicine, Cleveland Clinic in gastroenterology/hepatology, and most recently Stanford University in esophageal and motility diseases. Afrin shares a clinical passion in esophageal motility diseases with an an overlapping interest in health services and outcomes research.
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Kian Keyashian
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioThe management of inflammatory bowel disease continues to evolve, with the introduction of biologic and small molecule therapies and new goals of treatment, with an emphasis on healing the bowel. My career goal since my graduation from IBD fellowship in 2012 has been to improve the outcomes and quality of life of patients with inflammatory bowel disease. In line with these goals, my research has focused investigating new noninvasive diagnostic test, finding factors early in the disease course that might predict a more aggressive disease course and need for different therapies, and investigating new promising effective medications with less side effects.
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Paul Kwo
Professor of Medicine (Gastroenterology and Hepatology)
BioDr. Kwo is currently Professor of Medicine and Director of Hepatology at the Stanford University where he joined the faculty in November 2016. Prior to joining the faculty at Stanford, he was at Indiana University for 21 years where he served as the Medical Director of Liver Transplantation. He has distinguished himself in the field of Hepatitis C therapeutics and has been the principal investigator on multiple international trials. He recently authored the ACG Clinical Guideline: Evaluation of Abnormal Liver Chemistries.
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Allison Kwong
Assistant Professor of Medicine (Gastroenterology and Hepatology) and, by courtesy, of Surgery (Abdominal Transplantation)
Current Research and Scholarly InterestsCirrhosis, portal hypertension, liver transplantation, transplant outcomes, organ allocation, population health, quality and systems improvement
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Uri Ladabaum
Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsGastrointestinal cancer prevention and risk management. Risk stratification. Cost-effectiveness analysis. Health services research.
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Alice A. Lee
Instructor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsDr. Lee's research focuses on the early detection of pancreatic cancer, including the investigation of risk factors for pancreatic cancer and biomarkers to detect early cancer.
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Andrew A. Li, MD
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Li is a board-certified, fellowship-trained gastroenterologist with Stanford Health Care. He is a clinical assistant professor in the Department of Medicine, Division of Gastroenterology and Hepatology at Stanford University School of Medicine.
A therapeutic endoscopy specialist, Dr. Li received fellowship training in gastroenterology, advanced endoscopy, and endoscopic surgery at Stanford University School of Medicine. He is board certified in internal medicine and gastroenterology.
Dr. Li specializes in advanced endoscopic procedures. His areas of expertise include endoscopic ultrasound (EUS), endoscopic retrograde cholangiopancreatography (ERCP), enteroscopy, endoscopic mucosal resection (EMR), and endoscopic submucosal dissection (ESD). He also specializes in esophageal peroral endoscopic myotomy (POEM), gastric peroral endoscopic myotomy (GPOEM), and Zenker’s diverticulum peroral endoscopic myotomy (ZPOEM).
In addition, he treats gastrointestinal cancers, including gastric (stomach) cancer and colon cancer. He is dedicated to helping patients by integrating leading-edge research and innovations with compassionate, patient-centered clinical care.
Dr. Li’s research interests include gastric cancer, innovations in advanced endoscopy and endoscopic surgery, and the application of artificial intelligence (AI) and other computational techniques for prevention, diagnoses, and treatments.
Dr. Li has published articles in the World Journal of Gastrointestinal Endoscopy, Gastrointestinal Endoscopy, and Endoscopy International Open. He has presented at national and international conferences held in Las Vegas; Washington, D.C.; and Seoul, Korea. In his many presentations, he has covered topics such as the prevention of gastric cancer and prevention of post-ERCP pancreatitis.
Dr. Li is a member of the American Society for Gastrointestinal Endoscopy, American College of Gastroenterology, American Gastroenterological Association, and American College of Physicians. -
David Limsui
Clinical Professor, Medicine - Gastroenterology & Hepatology
BioThroughout my career I have been extensively involved in post-graduate medical education and training of residents and fellows. I served on the AGA Future Trends Committee tasked with reporting the future of gastroenterology training programs and have been admitted into the AGA Academy of Educators. I joined Stanford for the incredible opportunity to be part of a dynamic division with excellent and dedicated faculty where one can achieve their greatest potential. I share the honor and privilege of leading our fellowship program and in the joy of teaching such talented and inspiring fellows. Together we strive to provide the best educational experience for our fellows to become outstanding gastroenterologists and future leaders in academic medicine.
My subspecialty areas of focus are inflammatory bowel disease and general gastroenterology. -
Anson Lowe
Associate Professor of Medicine (Gastroenterology and Hepatology), Emeritus
Current Research and Scholarly InterestsThe laboratory is focused on the relationship between injury, wound healing, and cancer. Esophageal, gastric, and pancreatic cancers are a focus. We are particularly interested in the regulation of cell signaling by EGFR, the EGF receptor. In addition to cancer pathogenesis, active projects include the development of new diagnostic assays and drugs.
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Linda Nguyen
Clinical Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsMy research interests focus on disorder of gastrointestinal motility. Specifically, those related to nausea and vomiting with or without gastroparesis, irritable bowel syndrome and chronic abdominal pain. My research focuses on understanding the cause of symptoms and development of new treatments targeting either symptom control and disease modification.
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Mindie H. Nguyen, MD, MAS, AGAF, FAASLD
Professor of Medicine (Gastroenterology and Hepatology) and, by courtesy, of Epidemiology and Population Health
Current Research and Scholarly InterestsWe conduct clinical trials and epidemiological, translational, and real-world studies of liver cancer, fatty liver (NASH, NAFLD), viral hepatitis B and C, liver cirrhosis, and liver transplant. We focus on risk identification for disease prevention and treatment for improvement of survival. We focus on sex, racial/ethnic, and socioeconomic disparities. We specialize in clinical trials, large international real-world consortium registry data, and large public/semi-public databases.
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Laura A. Pace
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioI am a physician-scientist specializing in neuroimmunogastroenterology with a focus on the diagnosis and care of people suffering from complex multisystem disorders involving the neuroimmune axis. Neuroimmune axis disorders are conditions at the interface of the nervous and immune systems and often involve autonomic nervous system dysregulation, extracellular matrix|connective tissue dysregulation, endocrine dysregulation, and metabolic dysregulation. These conditions disproportionately and more severely impact females and often have an onset after an immune activating event such as an infection, surgery, concussion, or physical trauma. The complex, multisystem nature of these conditions requires the integration of information from multiple domains to diagnose and identify personalized therapeutic interventions. While at the University of Utah, I was part of the NIH Undiagnosed Diseases Network from 2017-2024, an experience that furthered my resolve to develop a precision medicine program focused on neuroimmune axis disorders. I am an ardent patient advocate and serve on the boards of several patient advocacy groups.
I am board certified in Internal Medicine and Gastroenterology through the American Board of Internal Medicine, and Autonomic Disorders through the United Council for Neurologic Subspecialties. Additionally, I have formalized clinical training in Neurogastroenterology and Medical Genetics, and a PhD in Neuroscience. I am a former NIH Building Interdisciplinary Careers in Women’s Health (BIRCWH) Scholar. To date I have published over 120 peer reviewed scientific articles and have received research funding from the NIH and private foundations.
My research has spanned the study of mammalian cell signaling; the physiology, ecology, and evolution of microbial metabolism; and human-microbe interactions leveraging multiomics. Through several collaborative multidisciplinary research projects her current work is focused on decoding the molecular and cellular mechanisms of neuroimmune axis disorders. Some of these exciting projects include the application of next-generation environmental microbiology techniques to understand the complex human-microbiota interactions at mucosal interfaces; identifying genetic and environmental contributions to neuroimmune axis disorders; and the development and application of novel therapeutics to treat these disabling disorders. -
Walter Park
Associate Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsDr. Park's research interests are in the diagnosis and management of pancreatic cysts, acute and chronic pancreatitis. His approach incorporates methods in health services research including the use of observational datasets, cost-effectiveness studies, and the development of clinical cohorts.
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Gopanandan Parthasarathy
Clinical Instructor, Medicine - Gastroenterology & Hepatology
BioDr Nandan Parthasarathy is a hepatologist and physician-scientist in the Department of Gastroenterology and Hepatology at Stanford University.
After obtaining his medical degree in JIPMER, India, he completed a 2 year clinical research fellowship at Mayo Clinic, following which he completed his residency training at Cleveland Clinic, and GI and transplant hepatology fellowships at Mayo Clinic. During his fellowship, his research work was focused on exploring the immune mechanisms of liver injury in metabolic dysfunction associated steatohepatitis.
Clinically, he is focused on taking care of patients with MASH, cirrhosis and liver cancer.
His career goal is to study the gut-immune system-liver injury axis in order to bring novel therapeutics from the bench to bedside in patients with liver disease. -
Edward A. Pham
Instructor, Medicine - Gastroenterology & Hepatology
BioMy interest in medicine and research was triggered by my mother’s battle with chronic hepatitis C, which made me realize the transformational power of biomedical research in treating patients. Therefore, my career goal is to become a physician scientist in the field of gastroenterology and hepatology dedicated to translating discoveries in the laboratory into novel medical treatment modalities. My research focus is alterations in phosphoinositides signaling and its pathogenesis in cancers of the hepatobiliary and luminal GI tract with the goal to identify novel targets for therapeutic intervention. I also have a particular interest in understanding the interface between chronic viral infection and cancer through studying how the innate and adaptive immune system are perturbed in chronic viral infections
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Peter Poullos
Clinical Professor, Radiology
Clinical Professor, Medicine - Gastroenterology & HepatologyBioDr. Poullos is a native of Stockton California. He earned his B.S. at Santa Clara University and M.D. degree at the University of Texas Medical School at Houston, after which he did an Internal Medicine residency at the University of California-San Francisco, finishing in 2002. He stayed at UCSF as a Gastroenterology fellow until 2004. However, after a spinal cord injury, he decided to retrain in Radiology. He did his Radiology residency at Stanford University, where he also completed a fellowship In Body Imaging in 2009. Dr. Poullos is now faculty in both the departments of Radiology and Gastroenterology and Hepatology. His clinical practice is at the Stanford Medicine, where he specializes in CT, MRI, and ultrasound of the abdomen and pelvis. His interests include radiology of the acute abdomen, hepatobiliary imaging, and colorectal cancer screening.
Dr. Poullos is the Founder and Co-Chair of the Stanford Medicine Alliance for Disability Inclusion and Equity (SMADIE), a group composed of people with disabilities and their allies at Stanford Medicine. In that role, Dr. Poullos advocates for students and healthcare providers with disabilities and for health equity for disabled patients. He is a Faculty Advisor to the Stanford Medical Students with Disability and Chronic Illness (MSDCI) and the MSDCI National organizations. Dr. Poullos and SMADIE have made significant contributions to the disability community, including starting the Stanford Conference on Disability in Healthcare and Medicine, drawing over 1000 participants from 39 countries. He is the Co-Host of the popular “DocsWithDisabilities” podcast, has spoken internationally about disability access in medicine, and has written and researched in the field. One of his proudest achievements is co-creating the Disability in Medicine Mutual Mentorship Program, serving the needs of disabled medicine and healthcare students and practitioners. In 2022, Dr. Poullos received the Stanford President’s Award for Excellence through Diversity. -
Stephan Rogalla, M.D. Ph.D.
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
Current Research and Scholarly InterestsThe research interest of myself and my lab are in the field of early cancer detection using targeted molecular spies to highlight (pre)cancerous lesions. We as well aim to improve precision medicine in autoimmune disorders like inflammatory bowel disease and oncology.
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Arghavan Salles
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioDr. Salles is a minimally invasive and bariatric surgeon. She completed medical school and residency in general surgery at Stanford prior to completing her fellowship in minimally invasive surgery at Washington University in St. Louis. She stayed on faculty at Washington University for three years prior to moving back to Stanford in 2019.During the pandemic, Dr. Salles has served as a disaster relief physician, caring for patients with COVID in the ICU. Dr. Salles obtained a PhD in education from Stanford University during her residency training, and her research focuses on gender equity, implicit bias, diversity, inclusion, and physician well-being. Her R01 grant from the NIH focuses on sexual harassment. She is a sought-after speaker and has given over 100 national and international invited talks related to gender equity, physician well-being, and weight bias. She currently serves as the Special Advisor for DEI Programs at the Stanford University Department of Medicine where she is a Clinical Associate Professor.
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Atulkumar T. Shah, MD
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Shah is a board-certified, fellowship-trained gastroenterologist with Stanford Health Care’s Digestive Health program. He is a clinical associate professor of medicine in the division of Gastroenterology and Hepatology at Stanford University School of Medicine.
Dr. Shah treats all gastrointestinal and liver conditions, such as gastroesophageal reflux disease (GERD), colon polyps, hepatitis, inflammatory bowel disease, and irritable bowel syndrome. He has a special interest in the increasingly prevalent fatty liver disease, which allows him to work closely with patients to educate them about symptom management and making lifestyle changes that will improve their health and wellbeing.
Dr. Shah treats all gastrointestinal and liver conditions, such as gastroesophageal reflux disease (GERD), colon polyps, hepatitis, inflammatory bowel disease, and irritable bowel syndrome. He has a special interest in the increasingly prevalent fatty liver disease, which allows him to work closely with patients to educate them about symptom management and making lifestyle changes that will improve their health and wellbeing.
After more than two decades of practice, Dr. Shah added training in liver transplant to expand his knowledge of liver disease and offer his patients a “one-stop” resource for truly comprehensive care.
Dr. Shah is a member of the American College of Gastroenterology, American Society of Gastrointestinal Endoscopy, and American Association for the Study of Liver Disease.
Among Dr. Shah’s current research interests is the development of an algorithm assessing the impact of gastrointestinal disease management on readmission rates.
Dr. Shah brings a personalized approach to working with patients and to teaching the next generation of physician scientists the classic skills of careful listening and patient examination. Throughout his career, he has emphasized the fundamental importance of balancing scientific expertise with empathy and compassion.
As a volunteer with the non-profit organization Health Volunteers Overseas, Dr. Shah travels around the world to train physicians about liver disease management and treatment. He is director of the HVO site in Bangalore, India. -
Pradeep Kumar Siddappa, MD
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Pradeep Kumar Siddappa is a board-certified, fellowship-trained gastroenterologist with Stanford Health Care. He is also a clinical assistant professor in the Department of Medicine, Division of Gastroenterology & Hepatology at Stanford University School of Medicine.
Dr. Siddappa specializes in advanced endoscopy procedures to diagnose and treat gastrointestinal conditions. He focuses on pancreatic care, including acute and chronic pancreatitis, pancreatic cysts, and pancreatic cancer. He uses advanced, minimally invasive methods to help detect pancreatic cancer early and treat people who cannot undergo surgery.
Dr. Siddappa has studied many gastrointestinal conditions over the years, garnering grant funding and several awards. His primary research examines pancreatic cancer and how to catch it earlier through biomarkers in the pancreatic cyst fluid. He also investigates ways to improve endoscopic and duodenoscopic technology. He has developed new endoscopic techniques for diagnosis and treatment, including endoscopic ultrasound-guided omental fine needle aspiration.
Dr. Siddappa has published his findings in peer-reviewed journals including the Journal of Gastrointestinal Cancer, Clinical Endoscopy, JGH Open, and the World Journal of Gastrointestinal Endoscopy. He has also shared his research and presented it at conferences around the world, including at the annual Digestive Diseases Week. He has covered topics including new diagnostic markers in pancreatic cyst fluid, narrow band imaging, hepatocellular carcinoma, and pancreatic ductal adenocarcinoma.
Dr. Siddappa is a member of the American College of Gastroenterology, the American Gastroenterological Association, and the American Society for Gastrointestinal Endoscopy. -
Sundeep Singh
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioAfter living and training throughout the country, I am excited to be part of the Stanford team. As a result of both my personal experiences and training, I am passionate about ensuring that patients receive appropriate diagnostic testing and treatment options in order to improve people's quality of life. In collaboration with my amazing colleagues, I am confident in the high quality and easily accessible care we are able to provide to patients across northern California.
While my interest is most in inflammatory bowel disease, I am also interested in the interaction between mental health, incentives, and emerging therapies in gastroenterology. -
Sidhartha Sinha
Assistant Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsThere are two primary and overlapping emphases of my research, both of which are driven and united by needs-based innovation and translational potential:
(1) Understanding the microenvironment of the inflamed versus normal gut in order to identify better therapeutic targets for people with immune-¬mediated GI disorders. Here, our investigations include understanding the influence and interactions of pharmacologic and dietary interventions on gut microbiome/metabolomic changes and the host immune response. In the context of providing patients with new understanding and solutions for their disease, I have led and advised on the design of both pilot and large clinical trials (including new FDA approved therapies) for anti-inflammatory therapies;
(2) Applying novel approaches and technologies (including natural language processing, computer vision, and reinforcement learning) to identify and address unmet clinical needs. In this area we have ongoing and published efforts in my lab to validate and develop solutions to pressing clinical needs. We have developed/led new drug delivery technologies with a multidisciplinary team that have shown strong potential in ongoing human IBD clinical trials. My lab has utilized both supervised and unsupervised approaches to analyze social media discourse and unstructured data sets for identifying patient needs that are rarely addressed in clinical settings. We have gained insights into patient perceptions around preventative health interventions, such as health screening and diet, including the dearth of evidence-based dietary recommendations to treat IBD (despite strong patient desire for solutions in this domain). -
Irene Sonu
Clinical Associate Professor, Medicine - Gastroenterology & Hepatology
BioI am passionate about gut health and strive to provide the best care to my patients. I specialize in complex motility disorders of the gastrointestinal tract. My areas of clinical expertise include achalasia, dysphagia, eosinophilic esophagitis, gastroesophageal reflux disease, gastroparesis, functional dyspepsia, irritable bowel syndrome, and pelvic floor dysfunction. I also see patients in need of fecal microbiota transplant for recurrent C. difficile infection.
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Sean Paul Spencer, MD,PhD
Instructor, Medicine - Gastroenterology & Hepatology
BioSean Spencer, MD,PhD is a Gastroenterologist and Physician Scientist at Stanford University working with Justin Sonennburg,PhD to uncover the role of dietary intake on the gut microbiome and mucosal immune system. Sean obtained his medical degree University of Pennsylvania, earning his PhD studying nutritional immunology with Yasmine Belkaid,PhD at the National Institutes of Health (NIH), after which he moved to Boston for residency training at Massachusetts General Hospital and completed his Gastroenterology training at Stanford University. Sean’s career goal is to study mechanisms by which dietary intake influences our microbiome and immune system to better understand and treat gastrointestinal disease. Sean has launched a microbiome-focused clinical practice at Stanford where he is working to develop novel microbiome diagnostics and microbial medicines.
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Sarah Streett
Clinical Professor, Medicine - Gastroenterology & Hepatology
BioDr. Sarah Streett is a Clinical Professor of Medicine, the Director of Inflammatory Bowel Disease Education at Stanford, and she is passionate about taking care of people with IBD. She is a national expert in treating complex IBD and initiated a multi-disciplinary approach to care with colorectal surgery, pediatrics, and nutrition. In 2018 she received the Champion of Hope Award from the Crohn’s and Colitis Foundation and serves on their National Scientific Advisory Committee. Her interests focus on fertility and pregnancy in people with IBD, developing precision approaches to IBD therapy, and the role that the microbiome and diet play in its pathogenesis. She is a primary investigator of the Stanford IBD Registry and has research projects focused on optimizing clinical outcomes in IBD, the role of the microbiota and diet in IBD and pregnancy, and applying new technologies to individualizing therapy for IBD. She is also the primary investigator on multiple industry-sponsored IBD trials.
Teaching is a top priority for Dr. Streett who feels that mentoring fellows in the development of their careers is a privilege. She has held many national leadership roles in the American Gastroenterological Association, where she has been Chair of the Practice Management and Economics Committee, and currently serves on the Government Affairs Committee. She also an appointed member of the Gastrointestinal Drug Advisory Committee at the FDA. She has represented the interests of gastroenterologists and their patients on Capitol Hill numerous times. Dr. Streett believes strongly in a collaborative approach to give patients personalized care based on the latest therapies for the treatment of IBD and is committed to mentoring the next generation of experts in the field. -
Natalie Torok
Professor of Medicine (Gastroenterology and Hepatology)
Current Research and Scholarly InterestsOur lab is focused on exploring the role of matrix remodeling in disease progression in metabolic dysfunction steatohepatitis (MASH)-related hepatocellular carcinoma and primary sclerosing cholangitis. Our goal is to uncover how biomechanical characteristics of the ECM affect mechano-sensation, and how these pathways could ultimately be targeted. We are also interested in aging and its effects on metabolic pathways in MASH and HCC.
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Mike Tzuhen Wei
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Wei was born and raised in Taipei, Taiwan. He went to Stanford for his undergraduate studies in Biology and earned his medical degree at Weill Cornell Medical College. Unable to stay far from the Bay Area, he returned to Stanford where he completed his residency in internal medicine and subsequently his fellowship in gastroenterology. Dr. Wei has specific interests in colorectal cancer and Barrett’s esophagus surveillance as well as reflux diagnosis and management. He has an interest in endoscopic resection of large polyps and had received training under Dr. Shai Friedland, a world expert in this field. Dr. Wei work focuses on evaluating new tools, technologies and techniques in gastrointestinal cancer surveillance and management. He has been involved in running several trials in endoscopic management of polyps and evaluating artificial intelligence applications in gastroenterology. His work has been published in American Journal of Gastroenterology, Gastrointestinal Endoscopy, Clinical Endoscopy, VideoGIE, and Digestive Diseases and Sciences. He was formerly an Associate Editor for the ACG Case Report Journal (2020-2022) and was on the Board of the Northern California Society of Clinical Gastroenterology. When not in clinic or in endoscopy, Dr. Wei enjoys spending time with his family. He and his family enjoy traveling and exploring new restaurants.
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Margaret J. Zhou, MD, MS
Clinical Assistant Professor, Medicine - Gastroenterology & Hepatology
BioDr. Margaret Zhou is a board-certified, fellowship-trained gastroenterologist with Stanford Health Care. She also holds an appointment as clinical assistant professor at Stanford University School of Medicine.
She specializes in therapeutic endoscopy with expertise in treating Barrett’s esophagus and disorders of the pancreas and bile duct. In particular, she offers advanced endoscopic interventions to prevent, detect, and manage gastrointestinal (GI) cancers. These interventions include endoscopic mucosal resection, endoscopic ablation, endoscopic retrograde cholangiopancreatography, and endoscopic ultrasound. She is also interested in the management of esophageal disorders such as gastroesophageal reflux disease.
Dr. Zhou has published widely on improving the detection of precancerous lesions and cancers of the GI tract. She is particularly interested in prevention, early detection, and outcomes in Barrett’s esophagus, esophageal cancer, and stomach cancer. In addition, she has published on new technologies and the use of artificial intelligence in GI. Her research has been published in multiple journals including Clinical Gastroenterology and Hepatology; Clinical and Translational Gastroenterology; and Cancer Epidemiology, Biomarkers & Prevention.
Dr. Zhou is an active member of multiple national GI societies. She currently serves on the American Gastroenterological Association (AGA) Clinical Guidelines Committee and AGA Trainee and Early Career Committee. She also serves as an Associate Editor for Evidence-Based GI, an American College of Gastroenterology (ACG) journal.
