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Under Secretary for Science and Technology
U.S. Department of Homeland Security
Assistant Secretary for Health Affairs and Chief Medical Officer
U.S. Department of Homeland Security
Assistant Secretary for Preparedness and Response
U.S. Department of Health and Human Services
Assistant Director, Weapons of Mass Destruction Directorate, Federal Bureau of Investigation
U.S. Department of Justice
Chief Executive Officer and Director, Center for Biosecurity
University of Pittsburgh Medical Center
Former Special Assistant to the President for Homeland Security and Senior Director for Biological Defense Policy (2007-2009)