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Peter van Inwagen is John Cardinal O'Hara Professor of Philosophy at the University of Notre Dame. He is the author of God, Knowledge, and Mystery: Essays in Philosophical Theology (1995), Metaphysics (1993), Material Beings (1990), and An Essay on Free Will (1983).
Dean Zimmerman is Associate Professor of Philosophy at Rutgers University. He has published articles on metaphysics in The American Philosophical Quarterly, Analysis, The Australasian Journal of Philosophy, Mind, The Monist, Nous, The Philosophical Review, Philosophy and Phenomenological Research, and other journals and collections.