What was the name of Georgia O'Keeffe's husband, the photographer who founded An American Place?

The photographer who founded An American Place and married Georgia O'Keeffe was Alfred Stieglitz.

An American Place was Stieglitz's final New York gallery. It opened in 1929 after his earlier galleries, including 291 and the Intimate Gallery, and displayed modern art and photography. O'Keeffe was among the artists whose work he represented.

Stieglitz played a major role in introducing European avant-garde art and supporting American modernists. His gallery activities helped create a serious audience for photography as an art form, as well as for experimental painting.

An American Place should not be confused with Stieglitz's earlier gallery 291. Both were important to O'Keeffe's career, but they had different names and operated at different stages of his career.