An expert hard bop tenor who tended to be overshadowed by more innovative contemporaries, Junior Cook was always a solid improviser. After playing with Dizzy Gillespie in 1958, Cook gained some fame for his longtime membership in the Horace Silver Quintet (1958-1964); when he and Blue Mitchell left the popular band, Cook played in Mitchell's quintet (1964-1969). Later associations included Freddie Hubbard, Elvin Jones, George Coleman, Louis Hayes (1975-1976), Bill Hardman (1979-1981), and the McCoy Tyner big band. In addition to many appearances as a sideman, Junior Cook recorded as a leader for Jazzland (1961), Catalyst (1977), Muse, and SteepleChase.