He is author of The Limits of Humanitarian Intervention: Genocide in Rwanda and co-editor of Gambling on Humanitarian Intervention: Moral Hazard, Rebellion and Civil War. His articles have appeared in Foreign Affairs, International Studies Quarterly, and The New York Times, and he has chapters in many edited volumes. Prior to his academic career, he was legislative director for then-U.S. Congressman (now Senator) Charles Schumer (D-NY). He holds a Ph.D. in Political Science from MIT and an M.A. in international relations and international economics from SAIS.