Lee Ann Daffner is the Andrew W. Mellon Foundation Conservator of Photographs at The Museum of Modern Art in New York City since 1998 and is responsible for all aspects of the preservation, conservation and materials research for photographs in all the Museum’s collections. She is a Professional Associate of the American Institute for Conservation. Lee Ann received a Master of Arts and Certificate of Advanced Study in the Conservation of Historic and Artistic Artifacts State University College at Buffalo with subsequent training and work experience at The George Eastman House, The Better Image, The Metropolitan Museum of Art, the National Archives in Washington D.C. and the Houghton Library at Harvard University. The Thomas Walther Collection project, funded in part by a major grant from the Andrew W. Mellon Foundation, is a new model for collaborative materials-based research between fields of conservation and art history.