Dennis Day born Owen Patrick Eugene McNulty, was an Irish-American singer and radio, television and film personality.
Day was born and raised in New York City, the second of five children born to Irish immigrants Patrick McNulty and Mary McNulty. His father was a stationary engineer. Day graduated from Cathedral Preparatory Seminary in New York City, and attended Manhattan College in the Bronx, where he sang in the glee club.
Day appeared for the first time on Jack Benny's radio show on October 8, 1939, taking the place of another famed tenor, Kenny Baker. He remained associated with Benny's radio and television programs until Benny's death in 1974. He was introduced as a young, naive boy singer ? a character he kept through his whole career. His first song was "Goodnight My Beautiful".
Besides singing, Dennis Day was an excellent mimic. He did many imitations on the Benny program of various noted celebrities of the era, such as Ronald Colman, Jimmy Durante, and James Stewart.