Thomas Baldwin is Professor of Philosophy at the University of York. His previous publications include G. E. Moore (1990), Contemporary Philosophy: Philosophy of English since 1945 (2001) and The Cambridge History of Philosophy 1870–1945 (Cambridge, 2003). He has also edited the revised edition of Principia Ethica (Cambridge, 1993) and a selection of Moore's papers, Selected Writings (1993). Consuelo Preti is Associate Professor of Philosophy at The College of New Jersey. Her recent publications centre on the relation between G. E. Moore's early theory of judgement and his ethics, and the relationship between Moore and Russell. She is also the author of On Kripke (2001) and On Fodor (2000).