Hofmann is also regarded as one of the most influential art teachers of the 20th century. He established an art school in Munich in 1915 that built on the ideas and work of Cézanne, the Cubists and Kandinsky; some art historians suggest it was the first modern school of art anywhere. After relocating to the United States, he reopened the school in both New York City and Provincetown, Massachusetts until he retired from teaching in 1958 to paint full-time. His presence in New York teaching had a significant influence on post-war American avant-garde artists—including Joseph Glasco, Helen Frankenthaler, Nell Blaine, Lee Krasner, Joan Mitchell, Louise Nevelson, and Larry Rivers, among many—as well as on the theories of Greenberg, in his emphasis on the medium, picture plane, and unity of the work. Some of Hofmann's other key tenets include his push/pull spatial theories, his insistence that abstract art has its origin in nature, and his belief in the spiritual value of art. Hofmann died of a heart attack in New York City on February 17, 1966.
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