Guiding Light was created by Irna Phillips and Emmons Carlson and began as an NBC Radio serial on January 25, 1937. On June 2, 1947, the series was transferred to CBS Radio,[6] before starting on June 30, 1952, on CBS Television.[7] It continued to be broadcast on radio until June 29, 1956.[8] The series was expanded from 15 minutes to a half-hour during 1968 (and also switched from broadcasting live to pre-taping around this same time), and then to a full hour on November 7, 1977. The series broadcast its 15,000th CBS episode on September 6, 2006.