Professor of Philosophy (Ph.D., University of Texas, 1975)
Research and teaching interests include ancient philosophy, ethical theory, the history of skepticism, and the philosophy of Wittgenstein. His publications include Unity and Development in Plato's Metaphysics (Open Court, 1985), Virtue and Knowledge (Routledge, 1991), Ancient Philosophy: a Beginner’s Guide (Oneworld, 2016) and numerous articles. He has edited Socrates: Critical Assessments (Routledge, 1996, 4 v.)