He holds a Ph.D. in Political Science from the University of California, Santa Barbara and has taught at Wichita State University and the Varna University of Economics in Bulgaria. Rupp's research and teaching interests center on post-Cold War armed conflicts and international institutions. Rupp has published scholarly articles in a range of publications, including "Cambridge Review of International Affairs," " The Journal of Strategic Studies," " the UCLA Journal of International Law and Foreign Affairs," ""and "East European Quarterly."