Roberts is returning to the agency where he made his name at the end of the 90s with work for clients including The Guardian.
In his new role at Leagas Delaney, Roberts will report to the executive creative director and chairman, Tim Delaney, and work across the agency's client list, which includes Glenfiddich and Dyson.
Roberts joined CHI as a creative director and partner in 2007. He began his career as a copywriter at Saatchi & Saatchi, before stints at DMB&B, Leagas Delaney, TBWA\London, Ogilvy & Mather and Abbott Mead Vickers BBDO.
Roberts has accumulated numerous D&AD Pencils, Cannes Lions and Campaign Press Awards for clients such as Waterstone's and The Big Issue, and was responsible for Argos campaigns at CHI.