Ruth J. Sample is Associate Professor of Philosophy at the University of New Hampshire. She teaches social and political philosophy, early modern philosophy, and feminist philosophy, and is the author of Exploitation: What It Is and Why It's Wrong (2003). Charles W. Mills is Professor of Philosophy at the University of Illinois at Chicago. He works in the area of oppositional political theory and is the author of three books: The Racial Contract (1997), Blackness Visible: Essays on Philosophy and Race (1998), and From Class to Race: Essays in White Marxism and Black Radicalism (2003). James P. Sterba is Professor of Philosophy at the University of Notre Dame, Indiana, where he teaches ethics and political philosophy. His publications include How to Make People Just (1988), Feminist Philosophies (2nd edn., 1995), Justice for Here and Now (1998), Earth Ethics (2nd edn., 2000), Three Challenges to Ethics (2001),and Morality in Practice (7th edn., 2003).