D. A. Henderson, is a Distinguished Scholar at the Center for Biosecurity of UPMC and a Professor of Public Health and Medicine at the University of Pittsburgh. He is Dean Emeritus and Professor of the Johns Hopkins School of Public Health and a Founding Director (1998) of the Johns Hopkins Center for Civilian Biodefense Strategies. Dr. Henderson’s previous positions include: Associate Director of the Office of Science and Technology Policy, Executive Office of the President (1990-93); Dean of the Faculty of the Johns Hopkins School of Public Health (1977-90); and Director of the World Health Organization’s global smallpox eradication campaign (1966-77).