Reporting to David Angelo, the chairman and chief creative officer, he will be responsible for heading the creative department of the recently launched London office (Campaign, 19 February).
He will also help staff other departments within the agency as well as implementing the agency's young talent initiative, called Green House. This will see three creative teams given the opportunity to work on select projects, resulting in a job offer for the winning team.
Angelo said: "Our goal was to find someone who embraces our brave philosophy, since bravery transcends language barriers and global borders. Frazer is nimble, scrappy and relentless."
At the same time, the agency has appointed Ben Callis and Justin Barnes, who have been working as freelance creatives at Mother, as creative directors and Kevin Doyle, a senior account handler at Innocean, as the senior account handler.
Jelleyman has been at TBWA for eight years working on accounts including Masterfoods, Sony PlayStation and Nissan. Before that, he worked at DDB as the head of art.
The Los Angeles-based agency, which handles clients such as Universal Studios and Bacardi, opened its doors in London in February with Kia Motors as its founding client. It will officially launch on 1 April.
Before moving to Mother, Callis and Barnes worked at Ogilvy & Mather on accounts such as Ford, American Express and Dove.
Before that, they worked at Saatchi & Saatchi on the Samaritans business.
While at Innocean, Doyle ran the account handling department and helped launch three Hyundai marques across Europe and the Middle East. He started his career at DDB Sydney where he worked on the Volkswagen business it handled.