Jaegwon Kim is William Perry Faunce Professor of Philosophy at Brown University. His publications include a number of influential papers in metaphysics and philosophy of mind, and the books Supervenience and Mind (1993), Mind in a Physical World (1998), Physicalism, or Something Near Enough (2005), and Philosophy of Mind , 2nd edn. (2006). He is co-editor of Blackwell's Epistemology: An Anthology , 2nd edn. (2008). Ernest Sosa is Board of Governors Professor of Philosophy at Rutgers University. With Jonathan Dancy he is also co-editor of another volume in the Blackwell Companions to Philosophy Series: A Companion to Epistemology (1993); and, with Laurence BonJour, of Epistemic Justification (2003) , a volume in the Blackwell Great Debates in Philosophy series. His other publications include Knowledge in Perspective (1991), A Virtue Epistemology (2007), and Reflective Knowledge (2009). Gary S. Rosenkrantz is Professor and Head, Department of Philosophy at the University of North Carolina at Greensboro. A practicing metaphysician for more than 30 years, Professor Rosenkrantz's published books include Haecceity: An Ontological Essay (1993) , and three works co-authored with Joshua Hoffman: Substance Among Other Categories (1994) , Substance: Its Nature and Existence (1996) , and The Divine Attributes (2002).