Biography provided by Focal press
 
Influenced by Ansel Adams, with Arthur Siegel (1913-1978), and Aaron Siskind, developed and taught an influential, expressive photography program at Chicago's Institute of Design (1946–1961) and later at Rhode Island School of Design (1964–1977). Covering themes from his daily life, such as his wife and daughter, the city, and the landscape, Callahan intuitively infused his elegant photographs with a sophisticated sense of grace that was simultaneously distant and personal. His spare, abstract, black and white compositions reflect his Bauhaus training in design and form, but he also worked later in life exclusively in color. Callahan's appeal was because he was a doer and not a talker, concerned with what he called "the standard photographic problems," such as composition, contrast, focus, motion, and multiple exposures. "Because I love photography so much I was a successful teacher, although I never knew what or how to teach. It's the same with my photography. I just don't know why I take the pictures I do."
 
(Author: RH)
 
Michael Peres (Editor-in-Chief), 2007, Focal Encyclopedia of Photography, 4th edition, (Focal Press) [ISBN-10: 0240807405, ISBN-13: 978-0240807409] (Used with permission)
 
Wikipedia
 
Harry Callahan may refer to: Harry Callahan (photographer) (1912-1999), American photographer Harry Callahan (character) or Dirty Harry, as fictional police detective portrayed by Clint Eastwood