Primary Care and Population Health
Showing 51-100 of 280 Results
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Elana Trubowitch Cohn
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Elana Cohn (She/Her) is a board-certified Family Physician, with a love for caring for the whole person and the entire family.
She completed her bachelor's degree in Neuroscience and Behavior at Barnard College, after which she worked as a Health Outreach coordinator on a mobile medical van providing care to the homeless population in NY, which sparked her love for primary care. She received her medical degree at Tel aviv University, and completed her residency at Mount Sinai and the Institute for Family Health.
Her practice spans care for all ages, with an emphasis on care for marginalized populations, reproductive health, office based-procedures, and teaching. She is passionate about integrating mental health care and reproductive justice into general practice, and making care for her patients as comprehensive as possible.
Outside of the office, she loves to travel and explore new places, dance her heart out, and spend time with her family. -
Alexandra Cours, MD
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Cours is a clinician educator in Geriatric Medicine at Stanford University, providing primary care for older adults and serving as a geriatric medicine consultant at Stanford Hospital. As Medical Director of the Acute Care for Elders (ACE) Unit, she leads specialized care for hospitalized older adults to optimize outcomes. She is also the Geriatric Section Director for Age-Friendly Health Systems, leading clinical and strategic efforts to advance age-friendly, evidence-based care across hospital settings and overseeing quality-improvement initiatives, including a delirium-reduction program. Dr. Cours leads a personal and professional development program for geriatrics fellows that prepares them for the transition to independent practice. In addition, she participates in the Foundations of Academic Clinical Excellence and Transformation (FACET) Faculty Development Fellowship and the Clinician Educator Scholars (CE Scholars) Program, which develop clinician expertise in ecosystem awareness, quality improvement, education, and clinical informatics through mentored initiatives that culminate in publishable work and career growth.
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Alia Crum
Associate Professor of Psychology and, by courtesy, of Medicine (Primary Care & Population Health)
Current Research and Scholarly InterestsOur lab focuses on how subjective mindsets (e.g., thoughts, beliefs and expectations) can alter objective reality through behavioral, psychological, and physiological mechanisms. We are interested in understanding how mindsets affect important outcomes both within and beyond the realm of medicine, in the domains such as exercise, diet and stress. https://mbl.stanford.edu/
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Nancy Cuan, MD
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Nancy Cuan is an internal medicine primary care physician at Stanford Coordinated Care (SCC). SCC is a primary care medicine practice that is a benefit for eligible members of the Stanford University, Stanford Health Care, SLAC and Lucile Packard Children’s Hospital community and their covered adult dependents with ongoing health conditions. More information, including a self-assessment to determine eligibility based on health condition(s) and health insurance, can be found at the Stanford Coordinated Care website.
Prior to joining Stanford Coordinated Care, she had practiced for many years at Santa Clara Valley Medical Center and helped with the resident training program there. She has had experience in working with patients with multiple ongoing medical conditions. -
Devika Madhu Das, MD
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Devika Das is a board-certified internal medicine doctor with Stanford Health Care. She is also a clinical assistant professor in the Department of Medicine, Division of Primary Care and Population Health at Stanford University School of Medicine.
Dr. Das is deeply committed to patient-centered care that provides comprehensive, personalized treatments tailored to her patients’ needs. In addition to primary and preventive care, she has special interests in fibromyalgia and mental health.
Dr. Das has presented to her peers at international and national meetings, including the International Congress of Controversies in Fibromyalgia, the Society of General Internal Medicine (SGIM) Annual Meeting, the American Diabetes Association (ADA) Scientific Sessions, and the American College of Physicians (ACP) Internal Medicine Meeting.
Dr. Das is a member of the ACP, the American Medical Association, the American Medical Women’s Association, and the SGIM. -
Korina De Bruyne
Clinical Assistant Professor, Medicine - Primary Care and Population Health
Current Research and Scholarly InterestsThe EMPOWER study (PI: Dr Beth Darnall) is looking at how to best support patients with chronic pain on long-term opioid therapy through a slow taper (maximal duration of 1 year). Patients are randomized to taper only versus taper plus community-based pain self-management group sessions versus taper plus psychologist-led cognitive behavioral therapy for pain group sessions. Along the way alternative measures to control pain are also explored. Enrollment is open until 10/2021.
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Anthony DuBose
Clinical Associate Professor, Medicine - Primary Care and Population Health
Current Research and Scholarly InterestsSoft tissue musculoskeletal injuries with focus on repetitive strain injuries
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Benjamin J. Durant, MD
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Benjamin Durant is a board-certified family medicine doctor at Stanford Health Care and a clinical assistant professor in the Department of Medicine, Division of Primary Care and Population Health at Stanford University School of Medicine.
Dr. Durant provides complete primary care for people of all ages, with a strong focus on health equity and supporting underserved communities. His clinical interests include outpatient care, prenatal and reproductive health, and treating substance use disorders. He has extensive experience in street medicine and mobile outreach to care for people experiencing homelessness. Dr. Durant takes a trauma-informed, relationship-based approach, building trust and meeting patients where they are.
His academic and service work has focused on improving access to care, training health care workers in under-resourced areas, and helping patients who face challenges like poverty, housing insecurity, or limited access to services. Dr. Durant’s approach to medicine is built on dignity, trust, and long-term relationships. He is committed to understanding and addressing the social factors that affect health. He has also volunteered internationally in Kenya and Haiti. -
Michelle Yixiao Engle, MD
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Michelle Engle grew up in Virginia, though she has also lived in China and Canada. She moved to California for medical training and quickly grew attached to the Bay Area. She is board-certified in family medicine and palliative medicine, providing holistic care to patients of all ages.
Her hobbies include barre, board games, escape rooms, cooking, and rock climbing. -
Andrea Fox
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioAndrea is a certified Physician Assistant who joined Stanford Health Care in 2019 to develop a comprehensive Fracture Liaison Service and bone health clinic championed by Dr. Michael Gardner, Trauma Orthopaedist. Andrea earned a Masters degree in Medical Science, Physician Assistant Studies and a Masters in Health Administration, both from the University of Missouri. She holds a current certification with the International Society of Clinical Densitometry and has completed her certificate trained as a fracture liaison clinician through the National Osteoporosis Foundation. She has a keen interest in educating primary care providers and the general public on the importance of early monitoring, risk factors and treatment for bone loss and the prevention and healing of fractures.
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Susan M. Frayne, MD, MPH
Professor of Medicine (General Medical Discipline)
Current Research and Scholarly InterestsPrimary care for mentally ill patients, particularly post-traumatic stress disorder in women seconday to sexual trauma.
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Eri Fukaya
Clinical Professor, Surgery - Vascular Surgery
Clinical Professor, Medicine - Primary Care and Population HealthBioDr. Fukaya practices Vascular Medicine at the Stanford Vascular Clinics and Advanced Wound Care Center. She received her medical education in Tokyo and completed her medical training both in the US and Japan. She joined Stanford in 2015.
Vascular Medicine covers a wide range of vascular disorders including chronic venous insufficiency, varicose veins, deep vein thrombosis, post thrombotic syndrome, peripheral artery disease, carotid artery disease, cardiovascular risk evaluation, fibromuscular dysplasia, rare vascular disease, lymphedema, arterial/venous/diabetic ulcers, and wound care.
Dr. Fukaya has a special interest in venous disease and started the Stanford Vascular and Vein Clinic in 2016.
Board Certified in Vascular Medicine
Board Certified in Internal Medicine
Board Certified in Internal Medicine (Japan)
Board Certified in Plastic and Reconstructive Surgery (Japan) -
Julieta Gabiola
Clinical Professor, Medicine - Primary Care and Population Health
Current Research and Scholarly InterestsIn the Philippines where hypertension and prehypertension are prevalent and medication not affordable, we are looking into prevention of hypertension through education and lifestyle modification as a practical alternatives.
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Pascal Geldsetzer
Assistant Professor of Medicine (Primary Care and Population Health) and, by courtesy, of Epidemiology and Population Health
BioPascal Geldsetzer is an Assistant Professor of Medicine in the Division of Primary Care and Population Health and, by courtesy, in the Department of Epidemiology and Population Health. He is also affiliated with the Phil & Penny Knight Initiative for Brain Resilience at the Wu Tsai Neurosciences Institute, Department of Biomedical Data Science, Department of Health Policy, and the Stanford Center for Population Health Sciences.
His research focuses on identifying and evaluating the most effective interventions for improving health at older ages. In addition to leading several randomized trials, his methodological emphasis lies on the use of natural experiments to ascertain causal effects in large observational datasets, particularly in electronic health record data. He has won an NIH New Innovator Award (in 2022), a Chan Zuckerberg Biohub investigatorship (in 2022), and three NIH R01 grants as Principal Investigator (in 2023 and 2024). In 2026, he was named one of the 100 most influential people in health and medicine globally by TIME Magazine. -
Linda N. Geng, MD, PhD
Clinical Associate Professor, Medicine - Primary Care and Population Health
Current Research and Scholarly InterestsMy scholarly focus is on puzzling and complex conditions. Our work aims to improve patients' diagnostic journeys, characterize poorly understood diseases, discover biological mechanisms, find treatments, improve care models, and reach communities in need.
With the COVID pandemic, the puzzling and complex illness of Long COVID or post-acute COVID-19 syndrome (PACS) emerged. Together with a multidisciplinary group of physicians and researchers, we launched a program here at Stanford to advance the care and understanding of Long COVID. Our goal is to better understand the natural history, clinical symptomatology, immunological response, risk factors, and subtypes of Long COVID. We are also actively assessing treatment strategies for Long COVID and developing care pathways and tools for clinicians to help their patients with this and other related infection-associated chronic illnesses. -
Karleen Giannitrapani
Assistant Professor of Medicine (Primary Care and Population Health)
BioIn contrast to bounded teams with static membership, dynamic teaming reflects the common challenge of interdisciplinary healthcare teams with changing rosters. Such dynamic collaboration is critical to addressing multi-faceted problems and individualizing care. At present, off the shelf interventions to improve the way healthcare teams work - often assume static and bounded teams. Dr Giannitrapani intends to leverage design approaches to build a new kind of healthcare “teaming intervention,” which respects the nature of their constantly changing membership and more closely aligns with how healthcare teams actually collaborate. Her expertise includes organizational behavior, building interdisciplinary teams, implementation science, mixed methods-research, quality improvement, pain and palliative care research, and global health.
In addition to the Assistant Professor role in Division of Primary Care and Population Health at Stanford University School of Medicine she serves as the quality lead for the section of Palliative Medicine. She is also a Core Investigator at the Center for Innovation to Implementation (Ci2i) in the VA Palo Alto Health Care System and serves as PI or co-investigator on multiple ongoing studies representing over 25 million dollars of competitive government grant funding. She is also a Director of the VA Quality Improvement Resource Center (QuIRC) for Palliative Care, supporting Geriatrics and Extended Care programs for 170 Veterans Affairs facilities nationally. In QuIRC she leads a portfolio of projects on improving the processes that interdisciplinary teams can leverage to improve pain and symptom management among high-risk patients; a specific focus of their work is to bridge the gap of poor palliative care integration in the perioperative period.
Dr Giannitrapani has given hundreds of presentations and have over 70 peer reviewed publications in high quality medical and health services delivery journals such as Medical Care, JAMA Surgery, the Journal of General Internal Medicine, the Journal of Pain and Symptom Management and Pain Medicine. She has received a 5-year VA Career Development Award on building better teams across disciplines and was an American Academy of Hospice and Palliative Medicine Research Scholar for related work. -
Alan M Glaseroff
Other Teaching Staff-Hourly, Medicine - Primary Care and Population Health
BioDr. Alan Glaseroff served as the Director of Workforce Transformation in Primary Care at Stanford from the fall of 2015 until mid-June of 2016, where he was responsible for training the teams for Primary Care 2.0, a radical redesign of primary care underway in 2016. He will be joining the faculty at Stanford's Clinical Excellence Research Center this summer, working with Dr. Arnie Milstein to help develop new models of care. He formerly served as Co-Director of Stanford Coordinated Care, a service for patients with complex chronic illness from 2011 to the end of 2015. Dr. Glaseroff, a member of the Innovation Brain Trust for the UniteHERE Health, currently serves as faculty for the Institute of Healthcare Improvement’s “Better Care, Lower Cost” collaborative and served as a a Clinical Advisor to the PBGH “Intensive Outpatient Care Program” CMMI Innovation Grant that completes in June 2015. He served on the NCQA Patient-Centered Medical Home Advisory Committee 2009-2010, and the “Let’s Get Healthy California” expert task force in 2012,. Dr. Glaseroff was named the California Family Physician of the Year for 2009.
Dr. Glaseroff’s interests focus on the intersection of the meaning of patient-centered team care, patient activation, and the key role of self-management within the context of chronic conditions.
The Coordinated Care clinic is an exclusive benefit for eligible members of the Stanford University, Stanford Health Care, SLAC and Lucile Packard Children’s Hospital community and their covered adult dependents with ongoing health conditions.
Please complete the Coordinated Care self-assessment to determine eligibility based on health condition(s) and health insurance: https://stanfordmedicine.qualtrics.com/SE/?SID=SV_2siBNrfJ8zmn3GB -
Cassandra Gross
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Cassandra Gross is a physician specializing in internal medicine and geriatric medicine, with a clinical focus on post-acute and long-term care. Dr. Gross is passionate about empowering older adults to make healthcare decisions that reflect what matters most to the individual and collaborating with interdisciplinary teams to deliver high quality care. Her academic interests include medical education in the skilled nursing facility setting, improving LGBT+ care across the continuum of care, and optimizing nutrition in older adults. She leads a Sustainable Practices Curriculum for geriatrics fellows to help foster self- reflection and career resilience.
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Matthew Gunther, MD, MA
Clinical Associate Professor, Psychiatry and Behavioral Sciences - Medical Psychiatry
Clinical Assistant Professor (By courtesy), Medicine - Primary Care and Population HealthCurrent Research and Scholarly InterestsDr. Gunther’s scholarly work focuses on neuropsychiatric syndromes arising in the context of medical illness, with particular emphasis on delirium, catatonia, psychopharmacology in the medically ill, and the psychiatric sequelae of critical illness. His research spans the identification, assessment, and management of acute brain dysfunction in hospitalized and critically ill populations, including studies evaluating delirium prediction tools, bedside diagnostic instruments, and neurorecovery outcomes following medical insults. He has contributed to the validation and clinical application of the Stanford Proxy Test for Delirium (S-PTD) and related delirium risk stratification efforts, and has authored systematic reviews and case-based scholarship addressing catatonia, alcohol withdrawal syndromes, and medication-related neurotoxicity. In parallel, Dr. Gunther’s work in integrated behavioral health and medical education examines how psychiatry-led, skills-based interventions can improve recognition of neuropsychiatric and trauma-related symptoms in primary care and inpatient medical settings. Across these domains, his research emphasizes translational, clinically grounded approaches that equip non-psychiatric clinicians to manage complex neuropsychiatric presentations with greater confidence and precision.
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Lindsey Merrihew Haddock
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioLindsey Haddock, MD, MAEd, is a geriatrician and clinician-educator with a master's degree in education. Her research in medical education focuses on learning in the clinical workplace and evaluation of workplace-based assessments. She is the director of Primary Care and Population Health Clinician Educator (CE) Scholars Program, helping faculty develop and disseminate their work in medical education and quality improvement. She is the associate program director of the fellowship in Geriatrics. She is an Educator-4-CARE faculty in the School of Medicine, serving as a longitudinal teacher and mentor for medical students, and also precepts students in the ambulatory medicine clerkship. She works clinically in Stanford Senior Care Clinic and the inpatient geriatrics service.
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Kurt M. Hafer, MD, FACP
Clinical Associate Professor, Medicine - Primary Care and Population Health
BioDr. Kurt Hafer is a board-certified physician and Fellow of the American College of Physicians (FACP) practicing Primary Care Internal Medicine exclusively at Stanford Concierge Medicine.
Dr. Hafer grew up in Chapel Hill, NC and attended Pomona College, where he received his undergraduate degree in Psychology. After completing post-baccalaureate pre-medical coursework at the University of Michigan (UM) in Ann Arbor, he worked as a neuro-endocrine peptide researcher at UM.
In 1999, Dr. Hafer graduated from The University of Chicago Pritzker School of Medicine. He completed a Primary Care Internal Medicine Residency at Santa Clara Valley Medical Center (SCVMC) in San Jose in 2002. Between 2002 to 2012 he was a Teaching Attending Physician at SCVMC as well as an adjunct Stanford physician, training medical students and residents in Internal Medicine.
Dr. Hafer joined Stanford in 2012 as the founding Medical Director of the Stanford Primary Care, Portola Valley Clinic -- Stanford's first new primary care clinic in many years. His five years of leadership at the Portola clinic included incorporating the latest technologies into primary care, adopting active population health panel management, LEAN management practices, embedded specialists and evidence-based, best-care practices as a viable model for the future of Stanford Primary Care.
In January 2017, Dr. Hafer joined Stanford Concierge Medicine as Medical Director. In addition to caring for his patients, his duties include directing the clinic and expanding clinic offerings in mental health, wellness, and piloting Primary Care Genetics and Pharmacogenomics screening programs as a test bed for Stanford Primary Care.
While at Stanford, Dr. Hafer has served as a lecturer for the American College of Physician's Internal Medicine Maintenance of Certification Course held in San Francisco, and has been a Reviewer for the American College of Physicians on multiple projects. He has served on numerous Stanford Healthcare committees and worked with teams on numerous projects, including Stanford's Primary Care 2.0 Redesign, Hypertension Center of Excellence Clinical Integration Team, The Virtual Hypertension Monitoring Project, and Stanford's Primary Care Precision Health program design team. He has directed pilots of TeleHealth phone and video visits, integration of specialty care MDs into our primary care clinics. He led a successful Clinical Effectiveness Leadership Training (CELT) project using clinical pharmacists embedded in primary care clinics to more effectively manage diabetes and high blood pressure between MD visits. He has also served as the Physician Leader for Stanford's Realizing Improvement through Team Empowerment (RITE) Quality Improvement Program.
He currently serves as a Physician Member and Chair (2023, 2024) of the Global Executive Services (GES) Network Steering Committee, part of the Vizient University Health System Consortium, a national group of ~200 members of academic medical centers with Executive Health or Concierge Medicine services.
When not caring for patients, Dr. Hafer enjoys spending time outdoors with family and friends. He is married to a Stanford University History Professor, has a daughter who graduated from Stanford and UCLA Medical School (now a resident at UCSF), as well as a son who completed a masters degree in computer science at Stanford. He is an avid lifelong cyclist (road and MTB, logging up to 8k miles annually), hiker, has a passion for tinkering with vintage Datsuns and enjoys wearing vintage watches.
Dr. Hafer believes that a combination of truly knowing his patients as individuals, excellent patient-physician communication, and comprehensive preventive care allows him to provide exceptional care for his patients. -
James Hallenbeck, MD
Associate Professor of Medicine (Primary Care and Population Health) at the Palo Alto Veterans Affairs Health Care System, Emeritus
Current Research and Scholarly InterestsResearch in hospice and palliative care with emphases on physician education, cultural aspects of end-of-life care, and healthcare system issues.
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Josef Hannah
Clinical Assistant Professor, Medicine - Primary Care and Population Health
BioDr. Hannah graduated from Kansas City University of Medicine & Biosciences. He then completed a residency in Internal Medicine at the University of Kansas and a fellowship in Hospice & Palliative Medicine at Stanford University before joining as faculty at Stanford. His clinical practice includes both inpatient palliative care consultation as well as ambulatory care in palliative medicine. His research and educational interests include symptom management and utilizing media to grow palliative care services and education.
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Stephanie Harman
Clinical Professor, Medicine - Primary Care and Population Health
BioDr. Stephanie Harman is a palliative care physician and Clinical Professor of Medicine. She graduated from Case Western Reserve University School of Medicine and went on to complete a residency in Internal Medicine at Stanford and a Palliative Care fellowship at the Palo Alto VA/Stanford program. She then joined the faculty at Stanford. She co-founded the Palliative Care Program at Stanford Health Care in 2007 and served as Clinical Chief of the Section of Palliative Care in the Division of Primary Care and Population Health from 2016 - 2022. She was the inaugural Associate Chair for Women in Medicine for the Department of Medicine and is now the Associate Chair for Faculty Engagement and Leadership Development. She is Director of the Stanford Leadership Development Program, a joint program between Stanford Health Care and the School of Medicine for emerging leaders. A 2017 Cambia Health Foundation Sojourns Scholar Leader Awardee, she has a passion for leadership development and faculty engagement; she has built multiple programs to support the careers of women leaders in academic medicine, both locally and nationally. Her other professional interests include clinical ethics and serious illness communication.
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Shireen N. Heidari
Clinical Associate Professor, Medicine - Primary Care and Population Health
BioShireen Heidari, MD is a palliative care and family medicine physician. She works as part of the inpatient palliative care consult team providing symptom management and support for patients and families facing any stage of a serious illness. Dr. Heidari is the program director for the Stanford University Hospice and Palliative Fellowship. She previously served as the clinical lead for the Stanford site of the PERIOP-PC Study, collaborating with the surgical department to evaluate the impact of early palliative care support for patients and family members preparing for major upper gastrointestinal cancer surgery.
Dr. Heidari is also a writer whose pieces about the importance of human connection, tough conversations, and stigma around healthcare workers seeking help for their mental health have been published in The New England Journal of Medicine, The Lancet Respiratory Medicine, CHEST, The Journal of Pain and Symptom Management, and the Intima. She hopes that by sharing her own story, she can continue being part of these conversations as we advocate for culture change in medicine and more sustainable practice.
Before moving to northern California, Dr. Heidari attended medical school at Boston University, completed her residency at UC San Diego where she served as chief resident, followed by palliative fellowship at UCLA. Outside of her clinical and mentorship work, she is likely writing creatively or outside with her husband chasing their dogs. She is currently writing her first fiction novel. -
Heather Henri, MD
Clinical Associate Professor, Medicine - Primary Care and Population Health
BioDr. Heather Henri is a Clinical Associate Professor at Stanford University School of Medicine.
A graduate of Stanford University and the Harvard Medical School, she is Board Certified in Internal Medicine and a Fellow of the American College of Physicians. A Biological Sciences major at Stanford, Dr. Henri was awarded the President’s Award for Academic Excellence. She received an American Heart Association Internship at the National Institutes of Health (NIH) and completed two Howard Hughes Medical Institute Research Fellowships at the NIH.
Following medical school, she completed Internship and Residency at Stanford Hospital, then joined the Stanford Medical Group and was subsequently appointed Clinic Chief at the Blake Wilbur Clinic.
In 2013, Dr. Henri was one of two physicians selected to launch Stanford Concierge Medicine. During her 15-year tenure as a full time Internist at Stanford, she consistently received the highest tier of patient satisfaction scores.
Dr. Henri has served on Stanford’s General Internal Medicine Executive Committee and the Appointment and Promotions Committee. She was a member of the California Academic Collaborative on Chronic Care and co-authored the chapter “Hypertension: Context and Management” in the leading Textbook of Cardiovascular Medicine. She served on the Outcomes Research Advisory Board for Food Allergy Research and Education (FARE)– the world’s largest private source of funding for research dedicated to the prevention and treatment of food allergy. In addition, Dr. Henri was named a “Top Reviewer” by the Annals of Internal Medicine.
Dr. Henri works closely with the American College of Physicians (ACP) – the world’s largest medical society for Internists- and is one of the three Primary Care physicians in the country serving on the ACP 2027 Scientific Program Advisory Committee. She served for four years as the Director of the ACP Internal Medicine Maintenance of Certification Course held in San Francisco. Dr. Henri was a member of the ACP Internal Medicine Essentials Text and Online Questions Editorial Review Board, and authored educational material for the ACP’s Medical Knowledge and Self-Assessment Program. Dr. Henri has given several lectures for the ACP and reviewed podcasts created by the ACP for physician continuing education. In 2025 and 2026 Dr. Henri served as a Curriculum Subspecialty Editor.
Dr. Henri feels that comprehensive proactive preventive care and excellent personalized patient-physician communication are the foundations of her medical practice. She is pleased to see patients once a month at Stanford's Express Care, and otherwise as a Stanford Trusted Community Concierge Physician at the medical practice of Caras Health in Portola Valley.