Bonnie Yochelson is a former curator at the Museum of the City of New York and is currently completing a study on Riis with the support from the National Endowment for the Humanities. Sylvie Aubenas is Chief Curator of the 19th-century photographic collections at the Bibliotheque Nationale, Paris. She has curated several exhibitions on the work of such photographers as Nadar, Charles Aubry and Le Gray. Amanda Hopkinson is a writer, translator, curator and critic, whose area of speciality is Latin America. Mary Panzer is a historian and curator of photography. Gerry Badger is a photo historian and critic. He regularly writes and lectures on photography and has curated a number of exhibitions. His published books include Collecting Photography and monographs on John Gossage and Stephen Shore, as well as Phaidon’s 55s on Chris Killip (2001) and Eugene Atget (2001).