Wyllis Oswald Cooper (January 26, 1899 - June 22, 1955) was an American writer and producer.
He is best remembered for creating and writing the old time radio programs Lights Out (1934 - 1947) and Quiet, Please (1947 - 1949)
Born Willis Oswald Cooper in Pekin, Illinois, he attended Pekin High School, graduating in 1916. He soon joined the U.S. Cavalry where, achieving the rank of Sergeant, he spent time on the Mexican border. In 1917, he became a part of the Signal Corps and was sent to France during World War I. While in France he was gassed at the Meuse-Argonne Offensive 1. He remained on active duty until 1919 when he left to become an advertising writer, though he maintained his reserve status.
By the late 1920s he was writing advertising copy in Chicago and entered radio, writing scripts for the 1929-1931 NBC radio program The Empire Builders. He later worked as continuity editor of CBS Chicago and, in 1933, left to take the same position at NBC Chicago. In 1934 he created his best known dramatic series, a late night horror radio program called Lights Out, which he also directed. Airing at midnight, the program quickly earned a reputation for its gory deaths and sound effects.