J.D., University of Michigan; M.A. in Political Science, University of Michigan; A.B., Harvard University.
American constitutional law and theory; philosophy of criminal law; general jurisprudence; philosophy of sport; principled positivism; legal practices shaping principles and rules.
Leon Meltzer Professor of Law and Professor of Philosophy, University of Pennsylvania; Co-Director, Institute of Law and Philosophy; previously at University of Texas School of Law.
Jurisprudence Section Article Award, Association of American Law Schools (AALS), for 'How Practices Make Principles, and How Principles Make Rules'.
Co-editor in chief, Law and Philosophy; editorial boards: Stanford Encyclopedia of Philosophy (Philosophy of Law), Legal Theory, Oxford Studies in Political Philosophy, Criminal Law and Philosophy.