Aaron currently serves on the United Nations Panel of Experts for North Korean sanctions. He is also an Associate with the Project on Managing the Atom at the Harvard Kennedy School’s Belfer Center. Prior to his current appointment, Aaron spent a decade as a non-proliferation and counter-proliferation subject matter expert at the U.S. Department of Defense and Justice Department, where he specialized in WMD counter-proliferation investigations and operations, with an emphasis on threat finance and sanctions evasion. He has published his work in The Washington Quarterly, Survival, Nonproliferation Review, Contemporary Security Policy, the Strategic Trade Review, the Bulletin of Atomic Scientists, and the Diplomat, among others. Aaron holds a PhD and MPP in public policy and national security from George Mason University and a BA in international relations from Virginia Tech.