At the Crossroads of American Photography: Callahan, Siskind, Sommer, examines the pivotal interrelationship of three mid-century photographers who helped define the course of American photography: Harry Callahan, Aaron Siskind and Frederick Sommer (who lived in Prescott, Arizona). This exhibit has been held over until August 9th at the Scottsdale Museum of Contemporary Art. See this wonderful exhibit before it is gone. Click here for more information.