Pioneering American photographer who helped to establish photography as an accepted art form. Ran many famous New York art galleries in the early 20th century.
He was awarded the first-place prize by British magazine Amateur Photographer for "The Last Joke, Bellagio," which garnered him breakthrough notoriety.
His most famous photographs included "Winter-Fifth Avenue" from 1893, "The Terminal" from 1893, and "The Steerage" from 1907.
He was born in New Jersey to German-Jewish parents and studied mechanical engineering in Berlin. His second marriage was to the acclaimed painter Georgia O'Keeffe.
His works were featured alongside Claude Monet's in a 1912 exhibition of modern art.