What was Georgia O'Keeffe's final major New York gallery, opened by Alfred Stieglitz in 1929?

Georgia O'Keeffe's final major New York gallery associated with Alfred Stieglitz was An American Place.

Stieglitz opened An American Place in 1929 at 509 Madison Avenue in Manhattan. It followed his earlier galleries, including 291 and the Intimate Gallery, and became the principal venue for exhibitions of O'Keeffe's work during the later part of his life.

The gallery was more than a commercial showroom. Stieglitz used it as a meeting place for artists, photographers, writers, and musicians. O'Keeffe exhibited there repeatedly, and its program helped place her work within a broader story of American modernism.

An American Place continued operating until Stieglitz's death in 1946. The name is sometimes confused with 291 because both galleries were run by Stieglitz, but they were separate venues opened at different times and addresses.