In 1936, Morris was among the artists who founded the American Abstract Artists (AAA), the organization dedicated to promoting abstraction through exhibitions, lectures, publications, and films. His colleagues in the AAA included many of the most important artists working in abstraction at the time, including Ilya Bolotowsky, Lee Krasner, Willem de Kooning, Mercedes Matter, and David Smith. Morris served as the president of the AAA from 1949 until 1951.

Among his extensive network in New York was Albert Eugene (A.E.) Gallatin—a distant cousin of Morris’s—whose substantial collection of modern art became the foundation of the Museum of Living Art at New York University. Gallatin named Morris a curator of the museum in 1933. Together with Charles G. Shaw and Suzy Freylinghuysen (who married Morris in 1935), they became known as the “Park Avenue Cubists".

Beginning in the late 1940s, George L.K. Morris began to explore architectural imagery in his cubist compositions. Although Mihrab is entirely non-representational, its title and shapes reveal Morris’s interest in architectural forms. An element of Islamic architecture, the Mihrab is the oval niche on the wall of a mosque that indicates the direction of prayer and symbolizes an arched doorway leading to Mecca.

Exhibitions
American Abstract Artists, 1936-1946
Whitney Museum of American Art, 1938-1965
Carnegie Institute, 1944-1946
Pennsylvania Academy of Fine Art, 1945-1956
Art Institute of Chicago, 1942-1947