The photographer who promoted Georgia O'Keeffe's work was named Alfred Stieglitz.
Stieglitz was a major figure in American photography and modern art. He operated the influential gallery at 291 Fifth Avenue, where O'Keeffe's work was exhibited and where she received her first solo presentation in 1917.
He and O'Keeffe married in 1924 and remained connected until Stieglitz's death in 1946. Stieglitz also made hundreds of photographs of O'Keeffe, although their relationship was more than a photographer-and-subject arrangement.
His first name is sometimes confused with the names of other artists and photographers in O'Keeffe's circle. The canonical form is Alfred Stieglitz, not Arthur or Alexander Stieglitz.