<a href="https://findartvalue.com/artist/harry-callahan">Harry Callahan</a>, American, 1912-1999 Detroit native Harry Morey Callahan is recognized as one of the most influential American photographers and teachers of the second half of the 20th century. A self-taught photographer, he became interested in the medium in the late 1930s while working in the accounting department at Chrysler Corporati