Christopher Shields received his Ph.D. in Philosophy from Cornell University. Currently Shuster Professor of Philosophy and Concurrent Professor of Classics at the University of Notre Dame, he has also held permanent positions at the University of Colorado at Boulder, and the University of Oxford. In addition, he has held visiting posts at Cornell University, Yale University, St. Louis University, Stanford University, the Chinese University of Hong Kong, and the Humboldt University of Berlin. Robert Pasnau received his Ph.D. in Philosophy from Cornell University, and has taught at the University of Colorado Boulder since 1999. He is the editor of Oxford Studies in Medieval Philosophy and the Cambridge History of Medieval Philosophy and has published widely on both the history of philosophy and contemporary questions.