and from 1916 began to experiment with other styles. He taught at the Art Students League of New York summer school in Woodstock, New York in 1918. He was an instructor and then director of the summer school until 1921. One of Rosen's students there was the Canadian André Charles Biéler. In 1920 Rosen moved permanently to Woodstock with his wife and their two daughters. He became a close friend of the painters George Bellows and Eugene Speicher. By 1920 Rosen had adopted a cubist-realist style (later identified as Precisionism) that characterized his work for the remainder of his life. In 1922 Rosen, Henry Lee McFee and Andrew Dasburg founded the Woodstock School of Painting. Rosen taught at the Columbus Gallery of Fine Arts in Columbus, Ohio from 1924 to 1928. During the Great Depression the government commissioned Rosen to paint a series of murals in post offices. His murals in Beacon, New York and Poughkeepsie, New York included panoramas of the Hudson Valley and New York City, and historical scenes. The last was undertaken in 1939. He also executed work in Palm Beach, Florida, under this program. His modernist but realistic depictions of buildings, towers and smokestacks reflect the influence of Paul Cézanne. In 1940 Rosen was appointed temporary director of the Witte Museum School of Art in San Antonio, Texas. Rosen suffered a heart attack in 1942. After this he focused on small pastels and drawings. He died on 21 June 1950 in Kingston, New York at the age of seventy two. Work Rosen's impressionist winter landscapes of Pennsylvania and the coast of Maine, with forceful designs and bold, deeply layered brushwork, are thought by some to be his best work. His impressionist works were praised for their "virility, sincerity and power". Some of his simple but elegant compositions recall the style of Japanese prints. They were very well received at the time. Despite this, he turned to a cubist-realist style after moving to Woodstock. According to John Folinsbee, "Rosen was considering form in relation to warm and cool colors, lost and found edges, all of which contributed to intensify the illusion of space on flat canvas. Abstraction had gained for him a new importance." some critics consider his scenes of the towns of Rondout and Saugerties on the Hudson River to be his best work. However, another critic says that Rosen's bleak views of shabby buildings were