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Joan Rohlfing is President and COO of the Nuclear Threat Initiative, a nonprofit, nonpartisan organization working to prevent catastrophic attacks with weapons of mass destruction and disruption (WMDD)—nuclear, biological, radiological, chemical, and cyber. She has held senior leadership positions at the U.S. Department of Energy and served at the U.S. Department of Defense and on the staff of the U.S. House Armed Services Committee. She is a member of the U.S. Department of Defense Threat Reduction Advisory Committee.