Consciousness has long been regarded as the biggest stumbling block for the view that the mind is physical. This volume collects thirteen new papers on this problem by leading philosophers including Torin Alter, Ned Block, David Chalmers, Daniel Dennett, John Hawthorne, Frank Jackson, Janet Levin, Joseph Levine, Martine Nida-R?melin, Laurence Nemirow, Knut Nordby, David Papineau, and Stephen White.