Harry Morey Callahan was a twentieth century American photographer. Harry Morey Callahan was born in Detroit, Michigan. He worked at Chrysler when he was a young man then left the company to study engineering at Michigan State University. He dropped out, returned to Chrysler and joined its camera club.

Callahan began teaching himself photography in 1938. He formed a friendship with Todd Webb who was also to become a photographer. A talk given by Ansel Adams in 1941 inspired him to take his work seriously. In 1941, Callahan and Webb visited Rocky Mountain State Park but didn’t return with any photographs.