Christopher Green is Professor Emeritus of the History of Art at the Courtauld Institute of Art, London. Among his recent publications is Picasso: Architecture and Vertigo (New Haven and London, 2005). He has curated several exhibitions, including Juan Gris (Whitechapel Art Gallery, London, Staatsgalerie Stuttgart and Rijksmuseum Kröller-Müller, Otterlo, The Netherlands, 1992-93), and Henri Rousseau: Jungles in Paris (Tate Modern, London, Galeries nationales du Grand Palais, Paris and National Gallery, Washington D.C., 2006-07).