Silk's career as a voice actor began on 1999, in the video-game 40 winks and at the same time providing voice to the imposing Aks Moe (played by a different actor, Mark Coulier). It is Silk's voice we hear, supporting the vote of no-confidence against Chancellor Finis Valorum.
For the next years, Silk has been acting as voice actor in different video-games, including MediEvil II, Hogs of War, Gladiator: Sword of Vengeance, Black & White and, more recently, Dragon Quest VIII . He usually plays various characters in each of his works.
Since 2005, Silk has also been acting in TV series Fifi and the Flowertots (strangely credited as Mark Silk), and has also been acting in video-game Battalion Wars.