2018. Wars of Law: Unintended Consequences in the Regulation of Armed Conflict. Ithaca: Cornell University Press. Statistical Appendix. Replication Data.

  • Winner of the 2019 Best Book Award, International Collaboration Section, American Political Science Association.

  • Winner of the 2019 Best Book Award, International Law Section, International Studies Association.

2007. State Death: The Politics and Geography of Conquest, Annexation, and Occupation. Princeton: Princeton University Press. Replication Data.

  • Winner of the 2008 Best Book Award, Conflict Processes Section, American Political Science Association.


2019. “Homelands versus Minelands: When and Why Do Rebel Groups Commit to Adhere to International Humanitarian Law?” Journal of Global Security Studies. 4:2, pp. 149–68. With Margarita Konaev.

2018. “Religionist Rebels and the Sovereignty of the Divine.” Dædalus. 147:1, pp. 25–35.

2018. “Go Your Own Way: Why Rising Separatism Might Lead to More Conflict.” Foreign Affairs. 97:4, pp. 113–23.

2017. “Rebellion, War Aims, and the Laws of War.” Dædalus. 146:1, pp. 1–12.

2016. “An Occult of Irrelevance? Multimethod Research and Engagement with the Policy World.” Security Studies. 25:1, pp. 34–41. Featured in The Washington Post.

2015. “A Particular Difference: European Identity and Civilian Targeting.” British Journal of Political Science. 45:1, pp. 829–51. With Brooke C. Greene.

2014. “Dead Wrong? Battle Deaths, Military Medicine, and Exaggerated Reports of War's Demise.” International Security. 39:1, pp. 95–125. Featured in El País (Spain's leading daily), The New Republic and The Dish.

2014. “Membership Has its Privileges: The Changing Benefits of Statehood.” International Studies Review. 16:1, pp. 79–106. With Ryan D. Griffiths.

2014. “Nonfatal Casualties and the Changing Costs of War.” Policy Brief, Belfer Center for Science and International Affairs, Harvard Kennedy School, November.

2014. “The Fall and Rise of Peace Treaties.” AJIL Unbound. 108, pp. 46–51.

2013. “The Demise of Peace Treaties in Interstate War.” International Organization. 67:4, pp. 695–724. Featured in Slate. Replication Data.

2012. “Why States No Longer Declare War.” Security Studies. 21:4, pp. 557–93. Featured in The Atlantic. Replication Data.

2008. “A State of One’s Own: The Rise of Secession Since World War II.” Brown Journal of World Affairs. 15:1, pp. 199–209. With Ryan D. Griffiths.

2004. “State Death in the International System.” International Organization. 58:2, pp. 311–44. Reprinted in Handler, Scott, ed. 2012. International Politics: Classic and Contemporary Readings. Washington, DC:  CQ Press. Featured in USA Today.

Book Chapters

2013. “Why Are Failed States’ Borders Stable Against External Predation?” In Beck, Robert J., ed. Law and Disciplinarity: Thinking Beyond Borders. New York: Palgrave MacMillan.