Lecture on Helen Levitt by Jeff Rosenheim, photography curator at the Met 

Mr. Rosenheim, who was a personal friend of Levitt, is an expert in American photography with wide-ranging interests from 19th-century to contemporary art, Mr. Rosenheim has taught at Columbia University, New York University, and Bard College, and has lectured at Yale and Stanford universities. At the Metropolitan Museum, he has organized or co-organized 20 exhibitions and was responsible for facilitating the Museum's acquisitions of the archives of photographers Walker Evans and Diane Arbus. An authority on Evans, he has organized six exhibitions of the artist's work, and has authored eight publications on Evans. He has published essays on the work of numerous photographers including Diane Arbus and Robert Frank. He organized the major exhibition Photography and the American Civil War for the Metropolitan in 2013.