Louis Leon Ribak (3 December 1902 – 1979) was an American social realist and abstract painter who was a member of the "Taos Moderns" group of artists.
In 1929, he became a founding member of the John Reed Club, which was organized to support leftist artists and writers and was closely associated with the Marxist magazine The New Masses.
In 1933, he assisted Diego Rivera on his mural Man at the Crossroads, commissioned for Rockefeller Center and destroyed before completion.
[1] Seeking a healthier climate, Ribak and Mandelman moved to Taos, New Mexico in 1944.
In 1947, he and Mandelman founded the Taos Valley Art School, and Ribak was its director and an instructor until it closed in 1955.