Justin Gunnar Walter Chancellor (born 19 November 1971)[1] is an English musician, best known as the bassist for rock band Tool, a position he has held since 1995.

[citation needed] He started M.T.Void music project with Piotr "Glaca" Mohammed from Sweet Noise.

[3] He was educated at Tonbridge School in Kent, England, where he was the bass player for a school band named Slice of Life and used to perform a cover version of Corey Hart's "Sunglasses at Night" in the dining room of his boarding house.

Peach released the album Giving Birth to a Stone and two EPs, and supported Tool in 1994 in Europe before breaking up in 1995.

[4] In September that year, Chancellor moved to the United States and joined Tool full-time to replace Paul D'Amour who departed during the recording of the band's second full-length album.