He is the Virginia and D.K. Ludwig Professor in Cancer Research, Chairman of the Department of Radiology at Stanford University School of Medicine, and a professor by courtesy in the departments of Bioengineering and Materials Science and Engineering at Stanford University. Additionally, he serves as the Director of the Molecular Imaging Program at Stanford and Canary Center at Stanford for Cancer Early Detection. To date, he serves on many editorial and advisory boards and committees. He serves as the PI to various extramural funds as well as private foundations funds.