Jean-Louis Cohen is undoubtedly France's most authoritative and knowledgeable historian of twentieth-century architecture and urbanism. He divides his time between Paris and New York, where he is the Sheldon H. Solow Professor in the History of Architecture at the Institute of Fine Arts of NYU University. Tim Benton, a highly regarded Le Corbusier scholar, is a Lecturer in the History of Art, Open University, Milton Keynes, England.