One of the last living members of the avant-garde New York School of photography of the 1950s, street photographer Louis Stettner challenged many long-held tenets of photography as an art form. His Penn Station series of the late 1950s represents some of his most important work, presented here as a monograph for the first time. The series of 65 black and white images is less a portrait of the building itself than a study of people occupying the space, whether in transit or in suspension. Though Stettner initially deemed the images not "newsworthy" enough to publish, with time and distance their significance has been recognized, and the series is now considered a major work.