Cooper helped popularize the Hammond B3 organ as part of rock music, performing on recordings of Bob Dylan, Jimi Hendrix, The Rolling Stones, and The Who. He was a member of the legendary Blues Project, and later founded the group Blood Sweat & Tears. Now he teaches at The Berklee College of Music in Boston, and writes a monthly column for EQ Magazine. His autobiography, "Backstage Passes & Backstabbing Bastards: Memoirs of a Rock 'n Roll Survivor" (Billboard Books) which was first published in 1977 has just been updated and reissued.