When he left military service in 1957, Davidson worked as a freelance photographer for LIFE magazine and in 1958 became a full member of Magnum. From 1958 to 1961 he created such seminal bodies of work as “The Dwarf,” Brooklyn Gang,” and “Freedom Rides.” He received a Guggenheim fellowship in 1962 and created a profound documentation of the civil rights movement in America. In 1963, the Museum of Modern Art in New York presented his early work in a solo show.