He served as the head football coach the University of Oregon for one season in 1942, tallying a mark of 2–6, and as the head basketball coach at Oregon for five seasons (1944–1945, 1947–1951), compiling a record of 87–76.

Warren coached high school basketball at Astoria High School, leading the Fishermen and its two stars Bobby Anet and Wally Johansen to two consecutive state championships in 1934 and 1935.

Four years later, Johansen and Anet were the core of Oregon's 1939 national championship team.

[4] Warren died in Los Angeles on March 10, 1981, after suffering a heart attack on February 26, 1981, while on vacation in Mexico.

Conference tournament champion # denotes interim head coach