Stanford University
Showing 1-4 of 4 Results
-
John V. Gahagan, MD, FACS, FASCRS
Clinical Associate Professor, Surgery - General Surgery
BioJohn V. Gahagan MD is a Clinical Associate Professor in Colon & Rectal Surgery. He leads the Colon & Rectal Surgery residency program as Program Director and serves as Chief of Surgery and the Medical Director of Supply Chain at the Stanford Tri-Valley Hospital. He joined Stanford in 2019 to build the Stanford Colon & Rectal Surgery practice in the East Bay at Stanford Tri-Valley in Pleasanton and at Stanford Health Care – Emeryville. He has training in advanced minimally invasive surgical techniques including robotic and laparoscopic surgery. He has authored several textbook chapters and original articles in peer-reviewed journals. His clinical practice is focused on the surgical treatment of colon and rectal cancers, inflammatory bowel disease (ulcerative colitis and Crohn’s disease), and benign colon and anorectal diseases (diverticulitis, hemorrhoids, fistulas, fissures). He believes in patient-centered care and multi-disciplinary approach to the treatment of diseases of the colon, rectum and anus.
Dr. Gahagan is passionate about surgical education. He serves as an Associate Program Director of the Stanford General Surgery Residency Training Program. In that role, he oversees resident evaluation and feedback. He led the revamp of the program’s evaluation process and Clinical Competency Committee – work that has been presented at the Association of Program Directors in Surgery (APDS) and the Accreditation Council for Graduate Medical Education (ACGME). In 2021, he established the Stanford General Surgery Endoscopy rotation, giving general surgery residents an opportunity to gain endoscopy experience by collaborating with faculty gastroenterologists and fulfilling their graduation requirements. In 2026, he established the Colon & Rectal Surgery residency program at Stanford and serves as the Program Director. At the time of accreditation, this program was the only ACGME accredited Colon & Rectal Surgery residency program in Northern California. In addition, he is the General Surgery Rotation Director for the Stanford Tri-Valley Family Medicine Residency. On a national level, he is an associate question writer for the American Board of Colon & Rectal Surgery and serves on the USMLE Step 3 Test Development committee and the USMLE Management Committee.
He also serves in various administrative roles, including as Chief of Surgery at the Stanford Tri-Valley Hospital. In 2025, he was appointment Medical Director of Supply Chain for the Stanford Tri-Valley Hospital. He is a member of the Stanford Medicine Partners Quality and Credentialing Committee, the Stanford Tri-Valley Operating Room Committee and the Stanford Tri-Valley Medical Executive Committee. -
Chandrayee Ghosh
Affiliate, Surgery - General Surgery
BioChandrayee Ghosh, PhD, is a Basic Life Research Scientist in the Department of Surgery at Stanford University School of Medicine and has been working in the field of Cancer and Immunology, with specific training and expertise in cancer therapeutics and translational science pertaining to drug repurposing and novel formulations of natural compounds. She has authored and coauthored 9 peer reviewed original articles in high impact journals. Her work has received media coverage both nationally and internationally. She presented her works in more than 18 international conferences and is recipient of research awards for her work. Her scientific contribution includes ground breaking findings such as identifying novel functions of FDA approved compounds and their combinations in targeting and assessing their mechanism of actions in one of the deadliest endocrine cancers anaplastic thyroid cancer, discovery of the interaction KDM3A with DCLK-1 and their role in pancreatic ductal adenocarcinoma tumorigenesis and stemness, identifying the cluster of master transcription factors or Super-Enhancers as novel targets for pancreatic cancer using novel formulation of natural compounds as anticancer agents.
-
Teodor Grantcharov, MD, PhD, FACS, FRCS (Glasg)
Professor of Surgery (General Surgery)
BioDr. Teodor Grantcharov is a board-certified, fellowship-trained surgeon specializing in bariatric (weight loss) and minimally invasive surgery. He is also a clinical professor of surgery at Stanford University School of Medicine and associate chief quality officer for innovation and safety at Stanford Health Care.
As a surgeon, Dr. Grantcharov specializes in minimally invasive and bariatric surgery. He is an accomplished researcher and leader in the field of surgical innovation and patient safety. His work has made important contributions in curriculum design, assessments of competence, and impact of surgical performance on clinical outcomes. Dr. Grantcharov developed the surgical Black Box concept, designed to transform safety culture in medicine and introduce modern safety management systems in high-risk operating rooms.
Dr. Grantcharov has published more 220 articles in peer-reviewed journals and given more than 200 invited presentations in Europe and North and South America. He holds several patents and is the founder of Surgical Safety Technologies, Inc.—an academic startup that commercializes the Black Box Platform™. Dr. Grantcharov has received several prestigious honors and awards, including the Queen Elizabeth II Diamond Jubilee Medal for his contributions in clinical research and patient safety in Canada.
Dr. Grantcharov is a fellow of the American College of Surgeons. -
Brooke Gurland, MD, FACS
Clinical Professor, Surgery - General Surgery
BioPelvic floor and functional bowel disorders encompass a wide range of symptoms and conditions that affect people of all ages and genders. These include constipation, obstructed defecation, fecal incontinence, rectal prolapse, pelvic organ prolapse, irritable bowel disorders, and urinary and sexual dysfunction. While rarely life-threatening, these conditions profoundly affect quality of life, self-confidence, and daily function — and they deserve the same serious, compassionate attention as any other illness.
I am a colorectal surgeon and lifestyle medicine physician specializing in anorectal disorders and pelvic floor dysfunction. I serve as Research Director of the Stanford Pelvic Health Center, where I lead a multidisciplinary program that brings together colorectal surgery, urogynecology, urology, gastroenterology, and pelvic floor physical therapy to provide integrated, whole-person care.
My surgical training was at Cleveland Clinic, where I spent nearly a decade building and leading a multidisciplinary pelvic floor clinic and performing hundreds of combined procedures with colleagues in urology and urogynecology. I was among the early adopters of robotic surgical techniques for women with combined vaginal and rectal prolapse, and developed expertise in complex procedures including repair of intestinal and rectovaginal fistula. Earlier in my career, I established a Pelvic Floor Center at Maimonides Medical Center, where I received a Jahnigan Career Development Award studying multicompartment prolapse in elderly women. I joined Stanford's Department of Surgery, Division of Colorectal Surgery in 2017.
My research spans surgical outcomes, pelvic floor quality of life, and patient-centered technology. I am the principal investigator for the Stanford Pelvic Health Registry, a longitudinal database of over 475 patients with rectal prolapse followed since 2018. I was a 2020–2021 Stanford Biodesign Fellow, and my current work includes development and validation of disease-specific patient education tools. I believe that patients who understand their condition make better decisions — and recover better too.
I am also board-certified in lifestyle medicine. Prevention, diet, exercise, pelvic floor physical therapy, and behavior change are not secondary to surgery in my practice — they are the first line of care. Surgery, when it is needed, works best in patients whose lifestyle has been optimized. This philosophy guides how I counsel patients and how I train the next generation of surgeons and clinicians.
When I am not in the clinic or operating room, I can be found at the farmers market, fermenting something in my kitchen, practicing yoga, or spending time with my dog.