Collaborated with Michael Mantler as synthesist on several recording and performing projects, including Alien (an almost entirely synthesized "orchestral" piece), Live, and (primarily as singer) in The School of Understanding.

He has worked as keyboardist with a great range of musicians, among them Herbie Mann, Elvin Jones, Tommy Flanagan, the Lighthouse All Stars, Emil Richards, Gil Evans, Charlie Haden, Carla Bley, John Carter, John Lennon, Leo Sayer and Meredith Monk, and has appeared with the London and Los Angeles Philharmonic orchestras. For many years he was a member of Frank Zappa's Mothers Of Invention, appearing on 105 (!) of their recordings. A long-time Los Angeles resident, he has written music for many plays as well as films, including work on Francis Ford Coppola's award-winning Apocalypse Now. Recently he has been featured as lead vocalist with The Grandmothers rock band. His latest solo album release is Hear Me Out on Echograph Records.