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. More 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.


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.


Andrea Jonas, MD

Associate Program Director

Dr. Andrea Jonas (Associate Program Director) 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!


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.


Teja Patil, MD, MPH

Associate Program Director - VA

Dr. Patil graduated from the University of California, San Francisco where she completed her MD and her residency in Internal Medicine. She joined the VA Palo Alto as a hospital medicine attending in 2015 where she attends on the wards and particularly loves nighttime medicine. She has served as the VA Palo Alto Nocturnist Director, Director of Surgical Comanagement and serves on the CPR committee More She particularly loves working alongside the medicine residents at night when the whole team admits new, undifferentiated cases and stabilizes nighttime emergencies. Dr. Patil’s particular passion is physician wellness; she co-teaches the resiliency curriculum for the Stanford IM residency. She is also a certified Physician Development Coach using coaching as a modality to support growth, wellness and excellence in clinicians across their career span.


Angela Rogers, MD, MPH

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.


2024-2025 Chief Residents

Hayley Galitzer, MD

Chief Resident

Hayley Galitzer earned a B.A. in Psychology from Columbia University, graduating summa cum laude and as a Rhodes scholarship finalist. She then worked for two years as a clinical research coordinator at Mount Sinai, before enrolling in medical school at NYU – where she was one of the very top medical students, earning Honors distinction in every core clerkship, and co-chairing the MD student ambassador program. We were thrilled when she matched with us for her residency training in 2021. More As a resident, Hayley has been a star. She has been the Chair of the Internal Medicine Wellness Committee from shortly after her arrival, she serves on the GME Wellness Committee, and she is an elected Class Representative. Her clinical acumen and caring are known throughout the residency program, and we can’t wait to work with her as a Chief Resident. After her Chief year, Hayley plans to pursue a career in academic Hospital medicine, with a continued focus on physician wellness.


Vishnu Nair, MD

Chief Resident

Vishnu Nair, a Bay Area native, pursued his undergraduate studies locally, earning a B.A. in Molecular and Cellular Biology with a Neurobiology emphasis from UC Berkeley, graduating magna cum laude. His academic journey led him to the David Geffen School of Medicine at UCLA for medical school, where he developed a deep interest in medical education, health services research, and point-of-care ultrasound (POCUS). More He spearheaded initiatives to enhance curricular development and broaden access to POCUS for medical students.


In 2021, Vishnu returned to his hometown, joining Stanford for his Internal Medicine Residency, committed to serving the community that nurtured him. As a resident, his clinical acumen and dedication to teaching did not go unnoticed. He was honored with the peer-selected Wolfsohn Award for Outstanding Performance in Internal Medicine in his second year and has been actively involved in teaching the Practice of Medicine course since his intern year.

Vishnu’s curiosity drives his current projects, which explore the optimal use of AI in medical education and scholarship. Following his Chief year, he aspires to build a career in academic Hospital Medicine, concentrating on medical education, clinical reasoning, and quality improvement.

Beyond his professional pursuits, Vishnu is an avid Bay Area sports enthusiast. He relishes California’s remarkable outdoor spaces, frequently engaging in activities like hiking, running, basketball, football, golf, and more with friends and family. His passion for these activities underscores his belief in balance and wellness.


Sulaiman Somani, MD

Chief Resident

Born in India, Sulaiman moved to the US at an early age and grew up in rural Georgia. He earned his B.S. in Chemical and Biomolecular Engineering from the Georgia Institute of Technology, graduating summa cum laude. He then enrolled in medical school at Mount Sinai, during which time he took a two-year leave to co-found and lead product development for Monogram Orthopedics, a startup that focuses on improving outcomes following hip and knee replacements by generating 3D-printed, More patient-specific implants from CT scans, work which has resulted in 9 patents being filed and the company having IPO’d in 2023. Upon his return to medical school, he fell in love with medicine and married his love of computer vision with new love of Cardiology by developing algorithms to improve disease diagnostics from electrocardiogram waveforms. He matched at Stanford for residency in 2021, where he continued his passion for Internal Medicine and Cardiology. As a PGY-2, he was a winner of the peer-selected Wolfsohn award for Outstanding Performance in Internal Medicine, the peer-nominated Best Clinical Teaching by a Medicine Resident Award, and the Award for Professionalism As A Member Of The House Staff in successive years. He has continued to publish AI-related research under the mentorship of Fatima Rodriguez, where he developed algorithms to understand public behaviors around key cardiovascular topics using social media data, earning the Young Investigator Award by the American College of Cardiology. After his Chief Resident year, Sulaiman plans to pursue a career in Cardiac Electrophysiology, with plans to focus on AI research.


Celeste Witting, MD

Chief Resident

Celeste grew up in Maryland, and stayed close to home for college at the University of Maryland, where she earned double degrees in psychology and biochemistry, and was active in her service fraternity Alpha Phi Omega. She then moved to Chicago for medical school at Northwestern University, where she developed her leadership skills on the Student Senate. Celeste then continued her westward migration when she matched at Stanford for internal medicine residency. More In her time here, she has been an active researcher, working with mentors Fatima Rodriguez and Alex Sandhu on projects related to disparities in cardiac care. She has also developed her skills as a clinical educator, creating curricula for her fellow residents on how to capture and read echocardiograms, and simulation sessions on how to respond to tachyarrhythmias. She was awarded the Arnold P. Gold Foundation’s Humanism and Excellence in Teaching Award from Stanford Medical School in March 2022. After her chief year, Celeste plans to pursue fellowship training in cardiology. Outside of the hospital, she enjoys traveling, board games, movies, and spending time with her friends, partner and cat.


Residency Staff

Karina Delgado-Carrasco

Director of Education Programs

Karina joined the Medicine Residency team in 2010, and she currently serves as the Director of Education Programs. 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 José State University. In her free time she enjoys cooking with her family, reading historical novels, and collecting unique children’s books for her daughter.

Audrey J. Austrie Holmes

Residency Program Manager

Audrey joined the Medicine Residency team in 2010, and currently serves as the 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.

Luis Hernandez

Residency Scheduler

Luis Joined the Medicine Residency team in 2022 and currently serves as the Residency Scheduler. He works directly with the Program Director, Program Manager, and Chief Residents to fully execute the residents schedule for the academic year. Luis is from Mexico City, MX, and is currently completing his BA in Global Health at Arizona State University. In his spare time, he likes to watch football, soccer, horse racing, and hang out with friends.

Holly Higa

Lead Residency Coordinator

Holly joined the Medicine Residency team in 2019, and she currently serves as the Lead Residency Coordinator. Her role with the program includes providing admin support to resident-led committees, organizing resident wellness activities throughout the year, and maintaining the program website.  Holly is from San Jose, California and has a BA in International Relations from UC Davis. In her free time she enjoys reading, watching basketball (go Warriors!), and listening to podcasts.

Michelle Lee

Recruitment and Event Lead

Michelle joined the Medicine Residency team in 2015 and serves as the Recruitment and Event Lead Coordinator. She plans several annual events for the residents, including the Intern and Resident retreats and Graduation. 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 toddler.

Rianna Garcia

Residency Coordinator

Rianna joined the Medicine Residency team in 2021 and currently serves as the Residency Coordinator. She supports the program by assisting in creating resident block and clinic schedules, preparing for recruitment, and creating content for the program's social media accounts. 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.

Minh Lan Nguyen

Residency Coordinator

Minh-Lan joined the Medicine Residency team in 2022 and currently serves as the Residency Coordinator. She supports the program through scheduling resident meetings with the Program Directors and assigning evaluations. Minh-Lan is from San Jose, CA and has a BA in Sociology from San Jose State University. In her free time, she enjoys spending time with her family.

Alice Leung

Educational Program Associate

Alice joined the Medicine Residency team in 2023 and currently serves as an Educational Program Associate. Alice supports the program by scheduling and operating educational lunch conferences and maintaining the office environment. Alice is from Morgan Hill, CA and has a BS in Public Health with a concentration in Nutrition and Food Sciences from San Jose State University. During her free time she enjoys reading, cooking, and finding new dessert spots to try.

Welcome from our Department and Program Leadership