W. D. Hart is currently a Professor of Philosophy at the University of Illinois at Chicago, where he chaired the Philosophy department for 12 years. He has also taught at the University of Michigan, University College London, and the University of New Mexico. He is the author of The Engines of the Soul, now available in paperback (Cambridge University Press, 2009), and the editor of The Philosophy of Mathematics, and has published more than seventy articles and reviews in academic journals.