Philip Pettit is the Laurance S. Rockefeller University Professor of Politics and Human Values at Princeton University, where he has taught political theory and philosophy since 2002. He received a BA and an MA from the National University of Ireland, and a PhD from Queen's University, Belfast. He has taught at Queen's University, University College, Dublin, and Trinity Hall, Cambridge. In 1976 he was appointed Professor of Philosophy at the University of Bradford, after which he moved to the Research School of Social Sciences, Australian National University, where he was Professor of Social and Political Theory and Professor of Philosophy. He works in two broad areas: the foundations of economics and the social sciences, including issues of psychology and metaphysics as well as methodology; and moral and political theory: the theory of what values our social institutions should realize and of how they can be best organized to promote such values. In both areas he works occasionally in more purely philosophical mode, sometimes in a mode that engages with economic and related methods; and in both areas, he works both alone and in collaboration with colleagues in philosophy, economics, political science, and law.