U.S. art therapy pioneers Margaret Naumburg and Edith Kramer began practicing at around the same time as Hill. Naumburg, an educator, asserted that "art therapy is psychoanalytically oriented" and that free art expression "becomes a form of symbolic speech which…leads to an increase in verbalization in the course of therapy." Edith Kramer, an artist, pointed out the importance of the creative process, psychological defenses, and artistic quality, writing that "sublimation is attained when forms are created that successfully contain…anger, anxiety, or pain." Other early proponents of art therapy in the United States include Elinor Ulman, Robert "Bob" Ault, and Judith Rubin. The American Art Therapy Association was founded in 1969.