P. M. S. Hacker is Emeritus Research Fellow at St John's College, Oxford. He is author of Insight and Illusion (Clarendon Press, 1972 [2nd revised ed. 1986]), the four-volume Analytical Commentary on the Philosophical Investigations, the first two volumes, co-authored with G. P. Baker, of Wittgenstein's Place in Twentieth-Century Analytic Philosophy (Blackwell, 1980-96), and Wittgenstein: Connections and Controversies (OUP, 2001). He has written extensively on philosophy and the neurosciences, most recently Philosophical Foundations of Neuroscience (Blackwell, 2003), and History of Cognitive Neuroscience (Wiley-Blackwell, 2008), co-authored with M. R. Bennett. He is currently writing a three-volume work on human nature, the first volume of which, Human Nature: the Categorial Framework, was published in 2007 (Blackwell). The sequel, Human Nature: the Cognitive and Cogitative Powers, is to be published in 2013.