Which artist was Georgia O'Keeffe's husband and a leading photographer of modernism?

Alfred Stieglitz was Georgia O'Keeffe's husband and a leading photographer of modernism. He also ran galleries that introduced European and American avant-garde art to influential New York audiences.

Stieglitz championed photography as a fine art and helped organize the movement known as Photo-Secession. Through galleries such as 291 and An American Place, he exhibited artists including Paul Cézanne, Pablo Picasso, and Marcel Duchamp, as well as American photographers and painters.

He encountered O'Keeffe's abstract charcoal drawings through Anita Pollitzer and began exhibiting her work in 1916. Stieglitz later photographed O'Keeffe extensively, producing an important body of portraits and nudes. Their professional relationship contributed to her early visibility, although her mature career developed through her own choices and work.

Man Ray, Edward Weston, and Ansel Adams were also major photographers, but none was O'Keeffe's husband. Stieglitz is the precise answer because he combined that personal relationship with a central role in American modernist photography.