John Aaron Lewis (3 May 1920 – 29 March 2001) was an American jazz pianist and composer best known as the musical director of the Modern Jazz Quartet. Born in LaGrange, Illinois and raised in Albuquerque, NM, he learned classical music and piano from his mother. He served in the Army in World War II, where he met Kenny Clarke. After the war, they moved to New York City and he joined Dizzy Gillespie's band. He also performed or recorded with Charlie Parker, Dizzy Gillespie, Illinois Jacquet, Miles Davis, and Lester Young.

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