Professor Emeritus at the University of Massachusetts at Amherst and Professor at the Central European University. He is an epistemic, evolutionary, and behavioral game theorist who studies the interplay of self- and other-regarding preferences in fostering cooperation and conflict. His recent books are The Bounds of Reason (Princeton University Press 2009), Game Theory Evolving (Princeton, 2nd ed. 2009), and A Cooperative Species (with Samuel Bowles).