Jon Pike is Senior Lecturer in Philosophy at the Open University. He is the author of "From Aristotle to Marx: Aristotelianism in Marxist Social Ontology" (Ashgate, 1999), co-editor, with Derek Matravers and Nigel Warburton, of "Reading Political Philosophy" (Routledge, 2000) and editor of "Debates in Contemporary Political Philosophy: An Anthology" (Routledge 2003).