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"): The New York school of photography is identified by Jane Livingston as "a loosely defined group of photographers who lived and worked in New York City during the 1930s, 1940s and 1950s" and who, although disinclined to commit themselves to any group or belief, "shared a number of influences, aesthetic assumptions, subjects, and stylistic earmarks".
Relevant evidence: No