Bernard Williams was Knightbridge Professor of Philosophy, Cambridge University (1967-1979), Monroe Deutsch Professor of Philosophy, University of California, Berkeley (1988-2003), and White's Professor of Moral Philosophy, Oxford University (1990-1996), and was a Fellow of All Souls College, Oxford until his death in 2003. Myles Burnyeat is Senior Research Fellow in Philosophy, All Souls College, Oxford. His books include "The 'Theaetetus' of Plato" (Hackett, 1990) and "A Map of Metaphysics Zeta" (Mathesis Publications, 2001).