 Cooper submitted his resignation on March 17, 1922, effective August 1, though after the board passed further budget cuts, he took an early leave in June, and assistant superintendent Thomas R. Cole succeeded him.Cooper was appointed to the Washington State Board of Education to succeed W. F. Geiger, taking office on June 17, 1921, and serving until he was succeeded by George B. Miller on May 1, 1923.After retiring, Cooper bought a ten-acre estate in Lake Forest Park.