He received his PhD in 1989 from the Department of Politics, Princeton University. Since then he has taught at American University and at Bar-Ilan University in Israel. His publications include Ethnoregional Conflict in Democracies as well as journal articles on nationalism, ethnic politics and terrorism. Presently, he is conducting research on the decline of settler nationalism in South Africa, Northern Ireland and Israel and its impact on resolving disputes between settler and native nationalist movements.