He was expelled from school[2] at the age of 16 and started attending house parties run by Bristol soundsystem The Wild Bunch (a predecessor of Massive Attack).

[3] He learned the basics about music production at his local youth club,[2] the Sefton Park basement project, which provided record players, a mixing desk, drum machines and samplers.

[6][7] The group's debut studio album, New Forms, was released on 23 June 1997, with singles featuring the vocals of Onallee including "Brown Paper Bag", "Heroes", "Share the Fall" and "Watching Windows".

The album went five times platinum,[8] won the Mercury Prize, and Williams returned to the studio to concentrate on his output for V and Full Cycle and Dope Dragon.

[citation needed] Williams subsequently teamed up with DJ Die and Leonie Laws in Breakbeat Era, before returning to Reprazent to record the second album, October 2000's In the Mode, which included guest vocals from Zack de la Rocha of Rage Against the Machine and Method Man of Wu-Tang Clan.

The reformed band included original members Dynamite MC, Onallee and bass player Si John alongside Yuval Gabay (Soul Coughing), D Product, Jay Wilcox and Pete Josef.

Roni Size and Reprazent toured in some of the biggest festivals in Europe, including Bestival, Glastonbury, Lovebox, EXIT and Rock Herk.

In September 2009, Roni Size and Reprazent played a gig with an orchestra and choir to mark the re-opening of Bristol's Colston Hall, collaborating with the BBC's Nature's Great Events composer, William Goodchild.