Stieglitz was the first art photographer in the US. More than any other American, he compelled the recognition of photography as a fine art. After editing a series of photography magazines, he established the famous gallery “291” in New York City. The gallery soon broadened its scope from fine-art photography and introduced to the US works by members of the modern French art movement, including Cézanne and Picasso. It also exhibited the works of what American artist whom Stieglitz later married? Discuss