I am a Professor at Georgetown University, with a joint appointment in the Department of Government and the School of Foreign Service.

My academic work covers topics in international-relations theory, American foreign policy, power politics, the politics of religious contention, and the relationship between popular culture and world politics. I am also interested how progressives should think about, and pursue, foreign policy.

My first book, The Struggle for Power in Early Modern Europe: Religious Conflict, Dynastic Empires, and International Change (Princeton University Press, 2009), won the International Security Studies Section (ISSS) Best Book Award for 2010. My second book, Exit from Hegemony: The Unravelling of American Global Order (Oxford University Press, 2020), co-authored with Alex Cooley, explores the contentious politics of international order. My co-edited volume, Undermining the Hegemon: The Politics of Goods Substitution, is forthcoming with Cambridge University Press.

I have held fellowships at Stanford University’s Center for International Security and Cooperation and at the Ohio State University’s Mershon Center for International Studies. During 2009-2010, I worked in the U.S. Department of Defense as a Council on Foreign Relations International Affairs Fellow. From 2014-2018, I was the lead editor of International Studies Quarterly.

I contribute to a group weblog: Lawyers, Guns and Money.