Erik Knudsen was born in Toronto, Ontario and broke into the acting scene when he played Young Tom Canboro in the 2000 film Tribulation. Since then, he went on to appear in Scream 4, Saw II and Good Cop, Bad Cop. He also appeared in Blackout, Stolen Miracle, Full-Court Miracle and A Lobster Tale.
Erik has also appeared on the television series Doc, Blue Murder, Kevin Hill and The Guardian (for which he received a Young Artist Award nomination). In 2003, he took the lead role in the children's comedy series Mental Block, portraying the character Donovan McKay. In 2007, he was cast as Dale Turner in the CBS post-apocalyptic drama, Jericho. Other credits of his include Degrassi: The Next Generation, Real Kids, Real Adventures and Santa Who?