Program Leadership

Ronald Witteles, MD

Program Director

Dr. Witteles (Program Director) graduated from The University of Chicago Pritzker School of Medicine, and he completed his Internal Medicine residency training, chief residency, and Cardiology fellowship training at Stanford. He is an active member of the Heart Failure faculty, and frequently attends in the CCU. He serves as Co-Director of the Stanford Amyloid Center and runs an active clinical More  research program in amyloidosis, cardiac complications of cancer therapy, and sarcoidosis. Dr. Witteles is the recipient of a host of clinical teaching awards, and housestaff education is his greatest passion.


Wendy Cáceres, MD

Associate Program Director

Dr. Cáceres (Associate Program Director) earned her medical degree and completed her Internal Medicine residency training at Stanford University School of Medicine. She is the Co-Medical Director of the Pacific Free Clinic in San Jose, CA. Her scholarly work focuses on medical education with a focus on primary care, as well as cultural competency, and unconscious bias in medicine. Dr. Cáceres is passionate about increasing diversity in medicine as she believes academic medicine is vital to the future of healthcare, and should be both diverse and inclusive. 


Shriram Nallamshetty, MD

Associate Program Director-VA

Dr. Nallamshetty (Associate Program Director at the Palo Alto VA) graduated from Duke University School of Medicine and completed his Internal Medicine residency at Stanford. Following a chief resident year at Stanford, he completed a fellowship in Cardiovascular Medicine at Massachusetts General Hospital and post-doctoral research training at the Brigham and Women’s Hospital in Boston. Dr. More  Nallamshetty’s clinical and research interests center on the metabolic underpinnings of cardiovascular disease. He currently attends in Cardiology and General Medicine at the Palo Alto VA and is actively involved in the clinical and research efforts in the Stanford South Asian Translational Heart Initiative (SSATHI).


Poonam Hosamani, MD

Associate Program Director

Dr. Hosamani (Associate Program Director) graduated from Northwestern Medical School and completed her Internal Medicine residency training at the Weill-Cornell Medical Center. She joined the Division of Hospital Medicine at Stanford in 2012 and attends on the Stanford general medicine wards. Dr. Hosamani is passionate about medical education and is the course director for the first-year Practice of Medicine course for Stanford School of Medicine students.  More  She also co-directs the Transition to Clerkships course and is an associate clerkship director for the Internal Medicine core clerkship. Her scholarly work focuses on bedside medicine through the Bedside Medicine group founded by Dr. Verghese.


Angela Rogers, MD

Associate Program Director

Dr. Rogers (Associate Program Director) graduated from Harvard Medical School, and completed her internal medicine residency at the Brigham and Women’s Hospital and Pulmonary and Critical Care fellowship in the Harvard program.  She moved to Stanford as an Assistant Professor in 2013.  She is focused on critical care education for both residents and fellows, and works on the More Medicine side of the Stanford Medicine-Anesthesia combined residency program.  Her research focus is on using genomics to identify novel biomarkers and improve phenotyping in sepsis and ARDS.


Andrea Jonas, MD

Associate Program Director

Dr. Andrea Jonas is a Clinical Assistant Professor in the Division of Pulmonary, Allergy, and Critical Care Medicine at Stanford University. She completed her undergraduate studies in chemistry and physics at Harvard University. She received her MD from Johns Hopkins University, where she stayed on to complete residency training in internal medicine on the Osler Medical Service. More She pursued fellowship training in pulmonary and critical care medicine at Stanford University, where she additionally completed a research fellowship in health care innovation and systems design as part of the Clinical Excellence Research Center. Since completing fellowship she has stayed on at Stanford as a clinician educator and serves as the associate program director for the PCCM fellowship and the IM residency programs. Her research interests include integrating technological innovations into healthcare system practices to improve delivery of pulmonary and ICU services. In her free time she enjoys gardening, watching the Great British Baking Show, and taking her dog on hikes in the Bay Area!

twitter: @andreajonasmd

Kevin Keet, MD

Associate Program Director

Dr. Keet graduated from The University of Vermont, College of Medicine and completed his residency at UCSF. He has worked with Stanford residents since starting as a hospitalist at the Palo Alto Veterans Hospital in 2010 and recently joined the program leadership. Dr Keet attends on the general medicine wards at both Stanford and the VA. He is a passionate and award winning medical educator with a focus on clinical decision making, resident wellness, and bedside medicine. More He believes that you should sit down with every patient, every time, and that each clinical decision should be contemplated in the context of the values and goals of person in front of you. Outside the hospital he likes to surf or bike with his two daughters and play with his goofy basset hound mixes.


Cybele Renault, MD, DTM&H

Program Lead in Global Health

Dr. Renault (Program Lead in Global Health) completed medical school and her Internal Medicine residency at The University of Chicago Pritzker School of Medicine, and after spending a year as Chief Resident at Cook County Hospital in Chicago, she came to Stanford for her Infectious Diseases fellowship. Dr. Renault has a particular interest in working with underserved populations with a focus More  on tropical disease and global health, where she has experience practicing medicine and teaching in Nepal, India, Thailand, Burkina Faso, Uganda and Zimbabwe. At Stanford, she is the primary attending physician on the inpatient Infectious Diseases consult service at the Palo Alto VA and is intimately involved with the Stanford Center for Innovation in Global Health (CIGH). Dr. Renault is Site Director for the  Johnson & Johnson rotation at Mulago Hospital in Uganda, and is Co-Director of the annual Stanford 2-week Intensive Global Health Course. She serves as a mentor and program point of contact for our Global Health Track residents, as well as for all of our residents interested in working overseas during their residency.


Robert Harrington, MD

Chair, Department of Medicine

Dr. Robert Harrington is the Arthur L. Bloomfield Professor of Medicine and Chair of the Department of Medicine at Stanford University. Dr. Harrington was previously the director of the Duke Clinical Research Institute (DCRI). His research interests include antithrombotic therapies in acute ischemic heart disease, mechanisms of disease of the acute coronary syndromes, risk stratification More in acute coronary syndromes, and clinical trial methodology. He has authored more than 400 peer-reviewed manuscripts, reviews, book chapters, and editorials. He is an associate editor of the American Heart Journal and an editorial board member for JACC. He recently served as a member and the chair of the Food and Drug Administration Cardiovascular and Renal Drugs Advisory Committee. He is a member of the Board or Trustees for the American College of Cardiology and he served as Chairman of the 2013 and 2014 American Heart Association Scientific Sessions.


Abraham Verghese, MD

Vice Chair for Education

Dr. Verghese graduated from Madras University Medicine, India, and he completed his residency in Internal Medicine and Fellowship at East Tennessee State University Medicine. He is an internationally popular author; his most recent novel, Cutting for Stone topped the New York Times bestseller list for over two years. He is a prominent voice in medicine with a uniquely More  humanistic view of the future of healthcare, marrying technological innovation with the traditional doctor-patient relationship. He pioneered the Stanford Medicine 25, a collection of technique-dependent bedside skills which all Stanford residents learn. Dr. Verghese is a 2014 recipient of the Heinz Award for Arts and Humanities.


2021-2022 Chief Residents

Jessica Buesing, MD

Chief Resident

Dr. Jessica Buesing grew up in Southern California before jetting off to the East Coast to Williams College where she earned her undergraduate degrees in music and psychology. After graduation, she spent a year teaching music in Italy before moving to New York City to start nursing school at Columbia University. She soon realized her true love of medicine and pathophysiology, and decided to pursue her premedical studies at Columbia’s postbac program and stayed there for medical school. More After nearly a decade of living in Manhattan and a year of dragging her son’s stroller up and down the New York City subway stairs, she was thrilled to come back to California for residency at Stanford. Here, she has been a part of the GME Women in Medicine group and is passionate about advocacy for women and parents in medicine. Her professional interests are in diversity and health equity, medical education, and hospitalist medicine. She has a son (Dominic), a daughter (Skylar), and two cats (Jelly Bean and Bodhi) who take up all her energy outside of the hospital. In her spare time she loves to hike, exercise, and sing.


Zachary Gray, MD

Chief Resident

Zach attended U of Rochester where he studied neuroscience and music. After three years of conducting research at Beth Israel Deaconess Medical Center, where he studied the use of transcranial magnetic stimulation to treat the symptoms of Parkinson’s disease and refractory depression, he attended New York Medical College. He moved to the West Coast for the first time to join Stanford’s Internal Medicine Residency Program. More At Stanford, Zach conducted research in understanding the contribution of aldosterone to development of hypertension through the concept of “aldosterone sensitivity." He also loves working as an educator and continues to pursue these passions as a Chief resident. After his chief year, Zach plans to pursue a career in Academic Hospital Medicine and Medical Education. When he is not in the hospital, Zach enjoys cooking, sourdough baking (despite a recent 2nd degree burn from a Dutch oven mishap), being outdoors and spending time with his wife and puppy.


Achyut Patil, MD

Chief Resident

Achyut Patil grew up in Chandler, Arizona - just outside Phoenix. He fled to the East Coast to experience snow for 8 years, at Yale for undergraduate and Harvard for medical school, then decided to come back out west for residency at Stanford. In residency, he spent plenty of time typing notes but got to do a lot of learning and teaching - and especially loved how easy it was to learn from our core wards attendings. More After chief year, he hopes to continue that interest in medical education during pulmonary and critical care fellowship, and eventually work as a MICU/pulmonary clinician-educator. His free time is primarily taken up by watching his many sports teams lose in excruciating fashion (he may never get over the Phoenix Suns' loss in the 2021 NBA Finals), but also by exploring the many hikes, breweries, and sports games in the Bay Area.

Twitter: @achyut_patil_


Gabriela Spencer Bonilla, MD

Chief Resident

Gaby earned a BA in Human Biology from Stanford, an M.Sc. in Clinical and Translational Science from Mayo Clinic, and an MD from University of Puerto Rico. Her academic interests include shared decision making, minimally disruptive medicine, research synthesis, addressing the negative effects of structural violence and racism on cardiovascular health and transthyretin cardiomyopathy. More She plans to pursue fellowship training in cardiovascular medicine. Her hobbies include swimming (preferably in heated pools!), bargain grocery shopping, hiking, exploring San Francisco (where she lives) and Oakland.


Residency Staff

Karina Delgado-Carrasco

Program Manager

Karina joined the Medicine Residency team in 2010, and she currently serves as the Program Manager. She is the Co-Chair for the Department of Medicine's Staff Diversity, Equity, and Inclusion Committee, and received Stanford GME's "Award for Outstanding Contributions to GME" in 2018.

Karina is from San Jose, California, has a BA in Public Health from UC Berkeley and a MA in Counselor Education from San Jose State University. In her free time she enjoys cooking with her family, reading historical novels, and collecting unique children’s books for her daughter.

Cindy Duong

Residency Program Coordinator

Cindy joined the Medicine Residency team in 2016 and is the Program Coordinator. She works with the resident led Wellness Committee to produce fun pop-up events throughout the year. Cindy is from Morgan Hill, CA and completed her B.S in Public Health while minoring in Biology at San Jose State University. Currently, she is a graduate student studying Counseling Education and a graduate teaching assistant in the Public Health department at San Jose State University. In her free time, she likes to visit her family in San Diego and host gathering with her friends.

Audrey J. Austrie Holmes

Assistant Program Manager

Audrey joined the Medicine Residency team in 2010, and currently serves as the Assistant Program Manager. She is the co-lead of the Department of Medicine’s Leadership Development Program (LDP), and the staff liaison for the Med Res Diversity Committee for residents and fellows.

Audrey is from the Bronx, NY, and has a BS in Psychology from Vanderbilt University in Nashville, TN.  During her free time Audrey enjoys hanging with her husband and two children and singing at her local church where she is the Campus Worship Director.

Holly Higa

Residency Program Coordinator

Holly joined the Medicine Residency team in 2019, and she currently serves as the Educational Program Associate.

Holly is from San Jose, California and has a BA in International Relations from UC Davis. In her free time she enjoys reading, crocheting, and listening to podcasts.

Michelle Lee

Recruitment Lead Coordinator

Michelle joined the Medicine Residency team in 2015 and serves as the Recruitment and Alumni Relations Lead Coordinator.  She plans several annual events for the residents, including the Intern and Resident retreats.  She participates in the Department of Medicine (DOM)’s Employee Engagement committee and was recognized as a DOM employee of the month.

Michelle is from Laguna Hills, CA (Orange County) and completed her B.A. in Communication and History at UCSD and her M.Ed. at UCLA.  She enjoys exploring touristy sites in the Bay Area and trying out the latest foodie spots with her husband and baby.


Rianna Garcia

Educational Program Associate

Rianna joined the Medicine Residency team in 2021 and currently serves as an Educational Program Associate. She supports the program by scheduling and operating educational lunch conferences and maintaining the office environment. Rianna is from Stockton, CA and has a BS in Public Health with a concentration in Health Services Administration from San José State University. In her free time, Rianna enjoys going to scenic places with friends, playing the piano, and trying new food places.

Welcome from our Department and Program Leadership