Peter Osborne is Professor of Modern European Philosophy and Director of the Centre for Research in Modern European Philosophy, Middlesex University, London, and (since 1983) an editor of the journal Radical Philosophy. His books include The Politics of Time: Modernity and Avant-Garde (Verso, 1995), and Conceptual Art (Phaidon, 2002). Eric Alliez is Professor of Contemporary French Philosophy in the Centre for Research in Modern European Philosophy, Middlesex University, London, and a founding editor of the French journal Multitudes. His publications include The Signature of the World. Or What is the Philosophy of Deleuze and Guattari? (Continuum, 2005).