John Sinclair

Part of the creative team that created the Rocky Horror Picture Show, he later worked at Sarm Studios in the 1970s and worked on Foreigner's early albums (alongside his cousin, Gary Lyons). He was then part of ZTT as a musician / producer.

Brother of Jill Sinclair.

He later left the music industry became a Rabbi with Ohr Somayach International.

The multi-credited British keyboard player and occasional producer John Sinclair (3) is a different artist.