His research addresses public opinion and comparative foreign policy and utilizes survey data to test claims about group identity and inter-group enmity in international relations. His other interests include mass-elite relations in democracies, the patriotism-cosmopolitanism debate and the history of international political thought.
His research articles have appeared in Global Society, International Interactions, International Studies Quarterly and Polity and he has also published over a dozen book chapters and shorter articles. He is co-editor (with Richard Sobel and Bethany Barratt) of Public Opinion and International Intervention: Lessons from the Iraq War (Potomac 2012).
He received his B.A. in Political Science from Haverford College and his Ph.D. in Politics from Princeton University.