Arthur Leipzig was born in Brooklyn, New York, in 1918. After studying photography at the Photo League in 1942, he became a staff photographer for the Newspaper PM, where he worked for the next four years. During this period, he completed his first photo essay, on children's street games. In 1946, he left PM. After a short stint at International News Photos, he became a freelance photojournalist, traveling on assignments around the world, contributing work to such periodicals as The Sunday New York Times, This Week, Fortune, Look, and Parade. He died December 4th, 2014.
Source
http://www.arthurleipzig.com/bio.html
Magnum Foundation Archive, MF014-001, Box 1, Membership Chronology