Sanjiv Sam Gambhir is the Director of the Stanford School of Medicine Program in Molecular Imaging. He is a Professor of Radiology (and of Bioengineering, by courtesy) and Head of the Division of Nuclear Medicine.

Dr. Gambhir's research interests are directed at the development of techniques to study various molecular/biochemical events taking place in living animals and humans, in their natural state, at the cellular and sub-cellular levels. Positron emission tomography (PET), single photon emission computed tomography (SPECT), and optical imaging are some of the tools being utilized to accomplish this study.