Jeff Simmons (born May 21, 1949 in Seattle, Washington) is an American rock musician best known as a former member of Frank Zappa's Mothers of Invention.Simmons provided bass, guitar, vocals and harmonica for Mothers of Invention during 1970 and 1971. He left the Mothers in early 1971 just prior to the filming of 200 Motels (where he was replaced by Ringo Starr's chauffeur Martin Lickert). Simmons later returned to the Mothers occasionally during the period of 1972 to 1974. Zappa and Mothers albums he appeared on include Chunga's Revenge (1970), Waka/Jawaka (1972) and Roxy & Elsewhere (1974).