Jon Elster is Robert K. Merton Professor of Social Science in the Department of Political Science at Columbia University. He has also taught in Paris, Oslo, and Chicago. His publications include Ulysses and the Sirens, Sour Grapes, Making Sense of Marx, The Cement of Society, Solomonic Judgements, Nuts and Bolts for the Social Sciences, Local Justice, Political Psychology, Strong Feelings, Alchemies of the Mind, and Ulysses Unbound. His research interests include the theory of rational choice, the theory of distributive justice, and the history of social thought.