An American songwriter, record producer and musician, known for organising Blood, Sweat & Tears (although he did not stay with the group long enough to share its popularity), providing studio support for Bob Dylan when he went electric in 1965, and also bringing together guitarists Mike Bloomfield and Stephen Stills to record the Super Session album. He has had a successful solo career since then, written music for film soundtracks, and has also lectured in musical composition. He continues to perform live.