Philip Pettit is Laurance S. Rockefeller University Professor of Politics and Human Values at Princeton University. He is the author of The Common Mind (OUP, 1996), Republicanism (OUP, 1997), A Theory of Freedom (OUP, 2001), and Rules, Reasons, and Norms (OUP 2002), and co-author of The Economy of Esteem (OUP, 2004), with Geoffrey Brennan; Mind, Morality, and Explanation (OUP, 2004), and Group Agency (OUP, 2011), with Christian List.