Thierry de Duve has written extensively on modern and contemporary art, with an emphasis on the work of Marcel Duchamp and its legacy. A regular contributor to the journal October, he is editor of The Definitively Unfinished Marcel Duchamp (1991) and the author of Kant after Duchamp (1995). He has taught in the US and France, and lives and works between Belgium and France.

Jean-François Chevrier is Professor of Contemporary Art History at the Ecole des Beaux-Arts, Paris. He has curated numerous exhibitions including: 'Another Objectivity' (with James Lingwood) (1989), 'Photokunst' (1989), 'Walker Evans and Dan Graham' (1992-1994) and 'Oyvind Fahlström', Barcelona (2001). He was also Curatorial Consultant for Documenta X in 1997. ??

Arielle Pelenc is an art critic and curator who lives and works in France. She has written for Artefactum, Art Press, Parkett and Arts Magazine. ??

Boris Groys was born in East Berlin and studied at Leningrad University. He emigrated to West Germany in 1981 and continues to work in Germany as a freelance author and critic. He has held senior academic posts at universities in Germany, Russia and the United Sates. He has been a contributor to Art in America and his books include The Total Art of Stalinism: Avant-garde, Aesthetic Dictatorship and Beyond (1992).