During a career spanning over thirty years Philip Pettit has made seminal contributions in moral philosophy, political philosophy, philosophy of the social sciences, philosophy of mind and action, and metaphysics. His many contributions would be remarkable enough in themselves, but they are made all the more remarkable by the ways in which Pettit connects them with each other. Pettit holds that the lessons learned when thinking about problems in one area of philosophy often constitute ready-made solutions to problems we faced in completely different areas. His body of work taken as a whole...