The Canadian baritone saxophonist and composer used lots of the U.K.’s perhaps most obviously modernists from the ‘60s, like the pianist John Taylor, saxophonists John Surman and Alan Skidmore, and composer/pianist/bandleader Mike Westbrook. Warren was musically self-taught before getting into the McGill School Conservatory in the past due ‘50s. Warren led his very own band in Britain from 1968; at several moments the group included Surman, Skidmore, Taylor, flugelhornist Kenny Wheeler, and saxophonist Ray Warleigh, amongst others. Warren performed in Westbrook’s Concert Music group from 1967-76, documenting using the group such albums as Marching Track Vol. 1&2 (Deram and Metropolis (BGO Information). With Surman, Warren documented his composition Stories from the Algonquin (Deram in 1971. He also toured using the London Jazz Composers Orchestra in 1972, and carried out and made up for Surman’s Brass Task within the ‘80s.