Question: Who is the photographer associated with the New York School of Photography whose used his camera as a tool for social reform.
Sentence (from "New York school of photography"): Livingston selects as key exponents of the New York school of photography Diane Arbus, Richard Avedon, Alexey Brodovitch, Ted Croner, Bruce Davidson, Don Donaghy, Louis Faurer, Robert Frank, Sid Grossman, William Klein, Saul Leiter, Leon Levinstein, Helen Levitt, Lisette Model, David Vestal, and Weegee.
Relevant evidence: No