David is Senior Program Officer, HIV/AIDS, TB, and Reproductive Health at the Bill & Melinda Gates Foundation in the USA. He received his M.D. degree from the New York University School of Medicine and Master of Public Health degree from the Johns Hopkins School of Public Health. He worked as a pediatrician in Washington D.C. before joining the Centers for Disease Control and Prevention (CDC) for a twenty-year career. At CDC, he worked in a variety of public health areas including infant mortality, homeless health, community health, epidemiology training and HIV and AIDS.

Prior to joining the Bill and Melinda Gates Foundation, David served as an advisor to the South African Department of Health, the Director of the CDC Global AIDS Program for South Africa, the Regional Director of the Global AIDS Program for Southern Africa, and the Director of the Global AIDS Program, Caribbean Regional Office. In January 2006, he joined the Bill and Melinda Gates Foundation as a Senior Program Officer, HIV, TB, and Reproductive Health. His responsibilities include supporting Gates Foundation country programs in India and China and HIV and AIDS related prevention advocacy in the United States.