Brad Roberts is director of the Center for Global Security Research at Lawrence Livermore National Laboratory in California. From April 2009 to March 2013 he served as Deputy Assistant Secretary of Defense for Nuclear and Missile Defense Policy. In this role, he served as policy director of the Obama administration’s Nuclear Posture Review and Ballistic Missile Defense Review. In 2010, he co-founded the bilateral Extended Deterrence Policy Committee with the Republic of Korea and the bilateral Extended Deterrence Dialogue with Japan. He also led the U.S. delegation to the NATO High-Level Group on nuclear policy. Prior to joining the Obama administration, Dr. Roberts was a member of the research staff at the Institute for Defense Analyses and an adjunct professor at George Washington University. His post-government publications include “Extended Deterrence and Strategic Stability in Northeast Asia” (National Institute for Defense Studies, Tokyo, Visiting Scholar Paper Series, No. 1, 2013).