Terry Penner is Professor of Philosophy, Emeritus, and was, for a time, Affiliate Professor of Classics at the University of Wisconsin-Madison. In Spring 2005 he was A. G. Leventis Visiting Research Professor of Greek in the University of Edinburgh. His previous publications include The Ascent from Nominalism: Some Existence Arguments in Plato's Middle Dialogues(1986) and numerous articles on Socrates.