Jon Elster holds the Chair of Rationality and Social Science at the Collège de France. His books include Ulysses and the Sirens (1979), Sour Grapes (1983), Making Sense of Marx (1985), The Cement of Society (1989), Solomonic Judgments (1989), Nuts and Bolts for the Social Sciences (1989), Local Justice (1992), Political Psychology(1993), Alchemies of the Mind (1999), Ulysses Unbound (2000), Closing the Books: Transitional Justice in Historical Perspective (2004), and Explaining Social Behavior: More Nuts and Bolts for the Social Sciences (2007). His research interests include the theory of rational choice, the theory of distributive justice and the history of social thought. He is currently studying the history of constitution-making processes, as well as the microfoundations of civil war.