After building experience in singing, stage and limited television work in the 1990s, he went onto roles in various small screen productions, most notably The Zack Files and Strange Days at Blake Holsey High.
Shortly after the cancellation of The Zack Files, Clark was cast in a similar television series, Strange Days at Blake Holsey High, which was first broadcast in the autumn of 2002.
[8] While Strange Days was on the air, Clark could be seen in the Sci-Fi Channel's Deathlands (2003), as the young son of a deceased future king who narrowly escapes death at the hands of his power-hungry brother.
In an April 2005 episode of Veronica Mars, Clark played an openly gay teenager recruited by the title character (Kristen Bell) to publicly humiliate the prejudiced ex-boyfriend (Jeff D'Agostino) of one of her friends (Natalia Baron).
Reviewing the episode, John Ramos of the website Television Without Pity commented positively on Clark's appearance, making an earnest request to "give the gay kid more screen time".
[9] Clark also had a supporting role as one of the ten children of a 1950s housewife (Julianne Moore) in the film drama The Prize Winner of Defiance, Ohio, released to theatres in late 2005.