Known for his boldly innovative explorations of his everyday life as well as the natural and urban landscape, Harry Callahan is a giant in the world of photography. This remarkable book, which includes more than 100 beautifully reproduced photographs, traces Callahan's career from the early 1940s to the present day and illuminates the connections between his subject matter and his constant experimentation. Callahan has consistently explored new ways of looking at the world around him - from high-contrast photographs of trees silhouetted against snow, to double exposures of his wife's nude figure merging into landscapes, to minimal abstractions - but he has used these experiments to reveal his relationships to the world around him. As a teacher at the Institute of Design in Chicago and the Rhode Island School of Design, he has influenced generations of younger photographers - and will continue to influence the art of photography for decades to come.