Which photographer founded the gallery 291, where Georgia O'Keeffe's work was first shown?

Alfred Stieglitz founded the gallery 291, where Georgia O'Keeffe's work was first shown. The gallery operated at 291 Fifth Avenue in New York and took its name from its street address.

Stieglitz opened the gallery in 1905 under the name Little Galleries of the Photo-Secession. It became known simply as 291 and exhibited photography alongside European and American modern art.

In 1916, Stieglitz displayed O'Keeffe's charcoal abstractions after seeing them through Anita Pollitzer. The exhibition introduced her work to New York's avant-garde art world and helped begin her long association with Stieglitz.

The gallery closed in 1917 because of financial difficulties. Stieglitz later continued showing O'Keeffe and other modern artists at different galleries, including The Intimate Gallery and An American Place.