English keyboard player and violinist who played in several notable progressive rock bands, including Roxy Music, Jethro Tull, and Yes.
He met the qualifications for admittance into the Royal Academy of Music, but had to wait a year before attending because of his age.
He also scored films and television shows, including almost 100 episodes of the television series Nash Bridges.
He was born in Billingham, England.
He also played with Frank Zappa from 1976 to 1977.