Charles Harrison is Professor of History and Theory of Art at the Open University. He is author of Essays on Art & Language (1991, 2001), Modernism (1997), Conceptual Art and Painting (2001) and Painting the Difference (2005).

Paul Wood is Senior Lecturer in Art History at the Open University. He is the author of Conceptual Art (2002) and has contributed to various publications in the history of modern art.

Jason Gaiger is Lecturer in Art History at the Open University. He is the editor and translator of Herder's Sculpture: Some Observations on Shape and Form from Pygmalion's Creative Dream (2002) and has published widely in the field of art history and aesthetics.