This book delves into the pioneering work of Aaron Siskind, a significant figure in American photography, exploring his evolution from documentary realism in the 1930s to abstract experimentation in the 1950s. It contextualizes his early work amid the Great Depression and the Photo League's influence, while highlighting his interests in vernacular and architectural photography during the 1940s. It follows his journey to controlled abstraction while teaching at the New Bauhaus and Rhode Island School of Design. Utilizing archives from the Center for Creative Photography, this study provides an in-depth look at Siskind's innovative approach.