Jon Elster is Robert K. Merton Professor of Social Science at Columbia University. He has also taught at the Université de Paris V, the University of Oslo, the University of Chicago, and the Collège de France. He is author of twenty-three monographs, translated into eighteen languages, and editor or co-editor of twenty-one volumes. Elster has held positions in departments of philosophy, history, sociology, political science, and economics and has published articles in journals spanning across these fields, as well as in law journals. He is a member of five scientific academies, has received honorary doctorates from seven universities, and has delivered over two dozen named lectures, including the Tanner lectures.