Dean Zimmerman (Ph.D., Brown University, 1991) has taught at the University of Notre Dame, Syracuse University, and Rutgers University, where he is now an associate professor. He has published numerous articles, mainly in metaphysics and philosophy of religion. He is co-editor (with Peter van Inwagen) of Metaphysics: The Big Questions (Blackwell, 1998) and (with Michael Loux) of The Oxford Handbook of Metaphysics (OUP, 2003).

John Hawthorne is Professor of Philosophy at Rutgers University. He has published numerous articles on metaphysics, philosophy of language, epistemology, philosophy of mind, and early modern philosophy. His books include Knowledge and Lotteries (forthcoming), Substance and Individuation in Leibniz (with Jan Cover, 1999), and The Grammar of Meaning (with Mark Lance, 1997).