Our Team

Sumant Ranji Headshot

Sumant Ranji, MD

Director, UCSF CoDEX
Professor of Clinical Medicine, Zuckerberg San Francisco General Hospital Division of Hospital Medicine

Sumant brings more than 20 years of experience in patient safety, quality improvement, and medical education to CoDEx. He first joined UCSF as a fellow in hospital medicine and clinical research, then went on to become a faculty member in the Division of Hospital Medicine at UCSF Health, where he held multiple leadership positions. Sumant then assumed the position of chief of the Division of Hospital Medicine (DHM) at the Zuckerberg San Francisco General Hospital (ZSFG) from 2016-2023. He now concurrently serves as the director of quality improvement and patient safety.

Learn more about Sumant here.

Benjamin Rosner Headshot

Benjamin Rosner, MD, PhD, FAMIA

​​Action Incubator Faculty Lead, UCSF CoDEX
Associate Clinical Professor, UCSF Division of Clinical Informatics and Digital Transformation (DoC-IT)

Ben is a nationally recognized researcher and entrepreneur in digital health who combines industry experience with pragmatic study design. His research focuses on feedback to physicians and health systems about their performance including performance on optimal use of the electronic health record, diagnostic performance (see GoodDx.org), and performance related to the implementation of digital health tools.

Learn more about Ben here.

Caroline Jens headshot

Caroline Jens, MPH

Project Manager, UCSF CoDEX

Caroline comes to CoDEx from the Gordon and Betty Moore Foundation, where she supported the Diagnostic Excellence Initiative and its recent conclusion.

Mika Rivera Headshot

Mika Rivera, MPS

Director of Communications

Mika brings a wide range of writing, branding, and dissemination expertise from previous roles with UCSF's development department, the Smithsonian, and various private and public sector organizations. 

Sarah Rosenthal Headshot

Sarah Rosenthal

Policy Translation Project Manager