Though Gareth is perhaps best known as Osian in Caerdydd, he also appeared on S4C as sociopathic skinhead Nicky in the second series of Y Pris, and troubled soldier Cliff in the feature film Cymru Fach. His theatre credits include Noises: Off and One Flew over the Cuckoo's Nest (Winner of Best Production, Theatre in Wales Awards 2002). Gareth is also a vocalist and plays drums for the band Hafaliadau = Equations.