- Visiting Professor, Universidade de São Paulo, Brazil, November 2014
- Vincent Woo Distinguished Visiting Scholar, Lingnan University, Hong Kong, October 2014
- Visiting Fellow, Universität Witten/Herdecke, June 2009
- Charles Moskos Distinguished Visiting Professor of Sociology, Northwestern University, Spring 2009
- Distinguished Visiting Fellow, Institute for Religion, Culture, and Public Life, Columbia University, Spring 2009
- Visiting Fellow, Max Planck Institute for Research in Collective Goods, Bonn (2005)
- Associate Professor, Department of Political Science, University of Chicago (from 2000 to 2003)
- Visiting Professor, Center for Advanced Social Studies, Juan March Institute (Madrid, Spain), Fall 2002 & Fall 1998
- Jean Monnet Fellow, European University Institute, Florence, Italy (from 1997 to 1998)
- Assistant Professor, Department of Politics, New York University (from 1994 to 2000)
- Assistant Professor, Department of Political Science, Ohio State University (from 1993 to 1994)
- Arnold Wolfers Professor, Department of Political Science, Yale University (from 2003 to 2017)
- Professor of International and Area Studies, MacMillan Center for International and Area Studies, Yale University
- Director, Program on Order, Conflict and Violence, Yale University
- Co-director, Hellenic Studies Program, Yale University
- Conflict, civil wars, insurgencies, political violence
- Formation of political cleavages and collective identities