When was Georgia O'Keeffe discovered?

Georgia O'Keeffe first came to the attention of New York art gallery dealer, Alfred Stieglitz in January 1916 when her friend Anita Pollitzer took some of Greorgia's recent charcoal drawing to Stieglitz to review. Stieglitz exhibited O'Keeffe's work for the first time in May 1916 at his gallery '291'.