Joshua D. Kertzer

Joshua D. Kertzer is the John Zwaanstra Professor of International Studies and Government at Harvard University, where he also serves as Director of Graduate Studies. His research integrates international security, political psychology, and foreign policy analysis.

His work examines public opinion formation, elite decision-making, and experimental approaches to international relations. Recent studies focus on how observers assess resolve in international conflicts, partisan influences on foreign policy attitudes, and the psychological foundations of reputation costs.

Publications demonstrate methodological innovation in combining survey experiments with archival research, exploring topics from democratic credibility to signaling in crisis diplomacy. His award-winning research has been recognized by the International Studies Association and American Political Science Association.