Dr. Sumant Ranji is a Professor of Clinical Medicine in the Division of Hospital Medicine at San Francisco General Hospital. He completed his Internal Medicine residency training at the University of Chicago, and served as Chief Medical Resident at Cook County Hospital in Chicago. He joined UCSF in 2002 as a fellow in hospital medicine and clinical research, and subsequently joined the faculty of the Division of Hospital Medicine, initially at UCSF Health and subsequently at San Francisco General Hospital, where he has worked since 2016.

Dr. Ranji's academic interests are in patient safety, quality improvement, and medical education. He has published widely on patient safety, with a particular focus on diagnostic errors and improving the safety of transitions in care. He is an an Associate Editor of BMJ Quality and Safety and is a co-investigator on AHRQ-funded diagnostic error research projects. He is a member of the UCSF Academy of Medical Educators and remains active in teaching medical students and residents, as well as mentoring students, residents, and faculty interested in careers in health care systems improvement. His clinical responsibilities include attending on the ward and medical consult services at San Francisco General Hospital.

Dr. Ranji has held multiple leadership roles in the Department of Medicine. He served as the Chief of the Division of Hospital Medicine at Zuckerberg San Francisco General Hospital from 2016-2023, leading the division's activities in the clinical care of hospitalized patients - including planning and leading the hospital medicine service's response to the COVID-19 pandemic - and being responsible for the mentorship and development of the division's 50 faculty and staff. Under his leadership, the division focused on improving care for vulnerable and marginalized patients by implementing innovative clinical services, leading educational and quality improvement programs, and conducting impactful research. Previously, Dr. Ranji served as associate program director for the UCSF Internal Medicine residency from 2007-2016, directing educational programs in systems improvement and developing experiential learning approaches to engage residents in improving the quality of care for hospitalized patients.