Joseph O’Mahoney is a Research Fellow at MIT and a Lecturer in Politics and International Relations at the University of Reading. His research primarily investigates international norm dynamics concerning the legitimacy of war and the use of force. Broader research interests include recognition and nonrecognition, how argumentation works, the proliferation of nuclear weapons, and whether and how we can establish motives or reasons for action in international relations. He has authored articles in International Organization, European Journal of International Relations, Journal of Global Security Studies, and International Theory, as well as other outlets. He received a PhD in Political Science from George Washington University in 2012 and previously taught at Seton Hall University, Brown University, George Washington University, and Regis College.