Hansen created the persona of Dr. Demento in 1970 while working at Pasadena station KPPC-FM. The positive listener response to the offbeat novelties that Hansen included in his rock oldies show led to his eventually turning it into an all-novelty show. At the end of 1971, he moved to KMET in Los Angeles. From 1972 to 1983, he performed a four-hour live show on KMET. Later, the show would be a two-hour live show on KLSX, and after they converted to a talk-only format, moved to KSCA. His weekly show went into national syndication in a two-hour all-novelty format in 1974, produced by his manager Larry Gordon of Gordon/Casady and during 1978_92 was syndicated by the Westwood One Radio Network. The Westwood One period marked the height of the show's national popularity; it was carried in most major radio markets, airing mainly on FM rock stations, usually late on Sunday evenings.