In 2015-2016, he served as a Senior Advisor in the Office of the Secretary of Defense for Policy on a Council on Foreign Relations International Affairs Fellow. His research primarily focuses on international security, conflict management and peacebuilding, and the relationship between international institutions and conflict. He is the editor of the book Nuclear Posture and Nonproliferation Policy: Causes and Consequences for the Spread of Nuclear Weapons, and his articles have appeared in the Journal of Politics, International Studies Quarterly, Journal of Conflict Resolution among others.