Over the course of the 20th century, photography evolved as an art form while serving as an eyewitness to social, cultural and political change. This book presents more than 80 significant images—many from unique vintage prints—that came to define their times, and invites us to take a fresh look at celebrated photographs by such masters of the medium as Berenice Abbott, Margaret Bourke-White, Robert Capa, Henri Cartier-Bresson, Walker Evans, Robert Frank, Consuelo Kanaga, Dorothea Lange, Gordon Parks and Edward Steichen. Drawing on the unparalleled Howard Greenberg Collection—446 photographs recently acquired by the Museum of Fine Arts, Boston—Viewpoints brings to vivid life the transformative power of photography, and invites the reader into a collection assembled with a connoisseur's eye by a former photographer who is also a gallery dealer and a strong advocate for artists.