- Father of actress Lindsey Haun.
- Is the guitarist for pop group Air Supply.
- Appeared, as a session musician, on Yes' 1991 "Union" album.
- Was a member of The Chris Squire Experiment.
- Helped form the progressive rock band CIRCA: with Yes musicians Billy Sherwood, Tony Kaye and Alan White.
- Was in the 1980s band "Lodgic" along with Billy Sherwood, who he has remained friends with ever since, working on music projects with him regularly. The band was formed by Jimmy with his childhood friend, Michael Sherwood, Billy's older brother.
- Son of Rouvaun.
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