Charles Brittain is the Susan Linn Sage Professor of Philosophy and Humane Letters at Cornell University. He is the author of various books and articles on ancient Greek and Roman philosophy and is a member of the organising committee of the Symposium Hellenisticum. James Warren is Professor of Ancient Philosophy at the University of Cambridge and a Fellow of Corpus Christi College. He is the author of various books and articles on ancient Greek and Roman philosophy and is a member of the organising committee of the Symposium Hellenisticum.