Charles Harrison is co-editor of Art in Theory 1900 - 1990 (Blackwell, 1992) and of Art in Theory 1815 - 1900 (Blackwell, 1997). He is the author of English Art and Modernism 1900 - 1939 (1994), of Essays on Art & Language, and of Modernism (1997) in the series "Movements in Modern Art". He has lectured widely in England, Europe and the USA and has been visiting Professor in History of Art at the University of Texas at Austin. He is currently Professor of the History and Theory of Art and Staff tutor in Arts at the Open University. Paul Wood is co-editor of Art in Theory 1900 - 1990 (1992) and of Art in Theory 1815 - 1900 (1998). He has published widely on modern art and art history in a variety of journals and exhibition catalogues. He has edited The Challenge of the Avant Garde (1998) and co-edited Investigating Modern Art (1996) and has contributed to Realism, Rationalism, Surrealism, and Modernism in Dispute (both 1993) and to Critical Terms for Art History (1996). He is Senior Lecturer in the Department of Art History at the Open University. Jason Gaiger is co-editor of Art in Theory 1915 - 1900 (1997). He has published various articles in the field of art history and aesthetics, and has been a visiting lecturer at the Universities of Essex, York and North London. He is currently Lecturer in Art History at the Open University.