Art critic, curator and professor of Contemporary Art History since 1988 at the Ecole Nationale Supérieure des Beaux-Arts of Paris. Consultant for Documenta X (1997), founder and editor-in-chief of the magazine Photographies (1982-1985), and curator of many international exhibitions, including: Walker Evans and Dan Graham (Rotterdam, Marseille and New York, 1992-1994); Des territoires (Paris 2001); L’Action restreinte. L’art moderne selon Mallarmé in Barcelona and Nantes (2004-2005); Art and utopia. Limited action in Barcelona (2005) and, until 31 March 2014, Biographical Forms. Construction and individual mythology at the Reina Sofia in Madrid. His main field of interest is the interaction between art and literature in the 20th century, with particular focus on the relationship between photography, architecture and visual art since the 1960s. Inside a 7-volume edition of his writings, he has published L’Hallucination artistique. De William Blake à Sigmar Polke (2012). The last volume Œuvre et activité is now being published.