DONALD C. ABEL is professor of philosophy at St. Norbert College in De Pere, Wisconsin. He holds a B.A. in philosophy from Gonzaga University, an M.A. in philosophy from Tulane University, a Ph.L. in philosophy from St. Michael’s Institute, an M.Div. in Theology from Loyola University of Chicago, and a Ph.D. in philosophy from Northwestern University. He is the author of Freud on Instinct and Morality (1989), Theories of Human Nature: Classical and Contemporary Readings (McGraw-Hill, 1992), and Fifty Readings Plus: An Introduction to Philosophy (McGraw-Hill, 2nd ed., 2010). He is the editor of Discourses, an electronic database of philosophy readings that is part of Create, McGraw-Hill’s online resource for creating customized textbooks. Professor Abel has received two awards for excellence in teaching and an award for outstanding scholarship. He is a member of the American Philosophical Association, the American Catholic Philosophical Association, and the Society for Ancient Greek Philosophy.