Donald Regan is the William W. Bishop, Jr.Collegiate Professor of Law and Professor of Philosophy in the University of Michigan. Educated at Harvard (mathematics), University of Virginia (law), Oxford (economics), and Michigan (philosophy), he has been at Michigan for his entire career. He has also taught at the University of California at Berkeley, Virginia, and Zagreb. He is a Fellow of the American Academy of Arts and Sciences, and has held fellowships from the Guggenheim Foundation, the National Humanities Center, the National Endowment for the Humanities, and All Souls College, Oxford (Visiting Fellow). He has written on moral, political, and legal philosophy; on United States constitutional law, especially federalism issues; and in recent years on international trade law. His book Utilitarianism and Co-operation (1980) was a co-winner of the Franklin J. Matchette Prize of the American Philosophical Association. His singing credits include La Bohème (Colline), Le Nozze di Figaro (Bartolo), Lucia di Lammermoor (Raimondo), and The Gondoliers (Duke of Plaza-Toro).