VERITY HARTE is George A. Saden Professor of Philosophy and Classics at Yale University. She is the author of Plato on Parts and Wholes: the Metaphysics of Structure (2002) and co-editor (with M. M. McCabe, R. W. Sharples, and Anne Sheppard) of Aristotle and the Stoics Reading Plato (2010) and (with Melissa Lane) of Politeia in Greek and Roman Philosophy (Cambridge, 2013). RAPHAEL WOOLF is Professor of Philosophy at King's College London. He is author of Cicero: The Philosophy of a Roman Sceptic (2015), translator of Cicero's De Finibus (On Moral Ends, ed. Julia Annas, Cambridge, 2001) and (with Brad Inwood) translator and editor of Aristotle's Eudemian Ethics (Cambridge, 2012). He has published articles on Plato, Aristotle and Hellenistic philosophy.