- He was a jazz bassist who was best known for the recordings he made from the late 1950s to the mid-1960s. He was discovered by trumpeter Kenny Dorham. Within a few years, he was working with New York's top hard-bop jazz musicians.
- He was the house bass player for the Blue Note record label. He is heard on albums by Dexter Gordon, Herbie Hancock, and Sonny Clark. He also toured the world with Thelonious Monk in the early 1960s.
- His father was an electronics technician and a pianist who played at local clubs. His mother was a typist at the CIA headquarters.
- When a visiting musician, a member of Duke Ellington's band, left a bass at the Warrens' house, Butch took up the instrument. He took lessons with Joseph Willens, a bassist with the National Symphony Orchestra.
- Jazz bassist.
- Studio musician for the Blue Note record label in the 1950s and '60s. Worked on albums with jazz musicians including Dexter Gordon, Donald Byrd, Herbie Hancock, and Sonny Clark.
- Toured the world with Thelonious Monk in 1963 and 1964.
- Has one daughter and one son Eric that died.
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