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. 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.


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.


2020-2021 Chief Residents

Adrian Castillo, MD

Chief Resident

I couldn’t be more excited to continue my time at Stanford as one of the Internal Medicine Chief Residents this year. I am a lifelong Californian, born and raised just outside of Los Angeles. I came to Stanford for my undergraduate and then returned home to complete medical school at the David Geffen School of Medicine at UCLA. When it came time for residency I couldn’t wait to come back to Stanford and have loved my time here. I am currently applying to cardiology fellowships and look forward to a career as an academic cardiologist.

What drew me to Stanford Internal Medicine more so than anything else was the emphasis this program places on resident feedback. No one knows the challenges of being a resident better than our current residents and our program leadership understands that. During my time in residency alone we altered the structure of several rotations, changed team patient caps, and modified our jeopardy system all based on resident input. I loved training in a resident-driven program that places so much emphasis on resident well-being.

Outside of work, you can find my partner and I wearing our Stanford gear (she’s an MBA and also happens to work for Stanford Health Care) and hitting the beach or hiking trails with our two dogs. I have also been slowly trying to improve my cooking skills with the help of YouTube (shout out J. Kenji Lopez-Alt) and can tell you all about the wonders of carbon steel. I love taking advantage of the incredible breweries and wineries in the area – there’s way more than just Napa. In addition, I’m slowly learning more about scotch, enjoy all types of board games and care too much about fantasy football. I am so excited to be with this program for another year and hope you will consider joining the Stanford family.

Mita Hoppenfeld, MD

Chief Resident

Hello! I am excited to be one of the Internal Medicine Chief Residents of 2020-2021. My path to medicine was a little different—I started out as a preliminary medicine intern at Massachusetts General Hospital, and came over to Stanford to do my Anesthesia residency. After doing my intern year, I realized how much I enjoyed internal medicine, and switched over to the Medicine-Anesthesia program at Stanford. After a few months working in the ORs, I knew I was an Internal Medicine doctor at heart requested to be a categorical medicine resident. After a few post-graduate switched, I was in the right place, and I never looked back! My interests throughout residency ranged from critical care medicine to improving care for marginalized populations. Next year, I will be pursuing a career in academic hospitalist medicine, with a path hopefully focused on improving care for underserved populations. In my personal life, my partner is an economics PhD student at UC Davis; we have a playful lab mix and an equally playful toddler who was born during residency. After four years with Stanford Internal Medicine, I still love it here because I felt truly supported throughout my training both personally and professionally. It is a place where I felt my happiness and my education were both primary goals. I am excited and honored to be a part of such a resident-oriented program as a Chief Resident.

Andrew Moore, MD

Chief Resident

I was born and raised in Virginia, and I went to undergraduate at the College of William and Mary followed by medical school at the University of Virginia. I’d actually never been to California before interviewing at Stanford, but it quickly became apparent that I had found the right place for me, even if it meant moving all the way across the country!  

I think my favorite thing about Stanford is the community and mentorship. I came to Stanford with practically no connections, but felt immediately welcome. I am constantly amazed at how down-to-earth and friendly the whole healthcare team are, from the nurses and case-managers to the residents and faculty.  It epitomizes what I think of as an academic hospital - filled with people who are so incredibly excited to learn, teach, and provide exceptional patient care. Everyone is committed to their patients and to each other.

The other thing I’ll highlight is that Stanford places a huge emphasis on maintaining a strong work-life balance. There is so much to do in the Bay area, and there is something to be said for knowing that you will have good weather no matter what day off you have. When I’m not in the hospital, you can find me riding one of my (probably too many) bikes through the redwood forests or along the coast, or enjoying one of the many breweries in the area. But the options are practically limitless with San Francisco, Napa/Sonoma, and numerous State/National Parks all within easy driving distance. 

I really can't imagine a better place to learn and pratice medicine than Stanford and I hope you'll consider joining this amazing community.

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

Educational Program Associate

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 serves as the Educational Program Associate.

Welcome from our Department and Program Leadership