Bruce Gellin, MD, MPH is an infectious diseases physician with a focus on the bridge between science, epidemiology, programs and policies in US and globally. He is currently an Adjunct Professor of Medicine and Senior Advisor, Global Health Institute, Georgetown University, and serves as a principal for the Vaccine Integrity Project at the Center for Infectious Diseases Research and Policy. He served as an Epidemic Intelligence Service Officer in the Meningitis and Special Pathogens Branch of CDC, and as Deputy Assistant Secretary for Health and Director of the National Vaccine Program Office in the US Department of Health and Human Services. He previously was President, Global Immunization of the Sabin Vaccine Institute and Senior Vice President and Chief, Global Public Health Strategy of the Rockefeller Foundation.