Elmer Clinton "Gloomy Gus" Henderson (March 10, 1889 – December 16, 1965) was an American football coach. He served as the head coach at the University of Southern California (1919–1924), the University of Tulsa (1925–1935), and Occidental College (1940–1942), compiling a career college football record of 126–42–7. Henderson's career winning percentage of .865 at USC is the best of any Trojans football coach, and his 70 wins with the Tulsa Golden Hurricane remain a team record. In between his stints at Tulsa and Occidental, Henderson moved to the professional ranks, helming the Los Angeles Bulldogs of the American Football League in 1937 and the NFL's Detroit Lions in 1939. Henderson also coached basketball and baseball at USC, each for two seasons.