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May 18, 1988
Prior to joining the Degrassi cast, he had a two-year run as Pleskit, the alien lead in the television series I Was a Sixth Grade Alien. Cooley's other television credits include the series, Are You Afraid of the Dark?, Queer as Folk, Lexx: The Series and Life with Derek. He has also appeared in the features Sachsenhausen 1944, Toy Men, Disney Channel movie The Color of Friendship, the Animal Planet movie Cybermutt and CBC TV movie Happy Christmas Miss King alongside his Degrassi co-star Lauren Collins. In 2006, Cooley was nominated for a Young Artist Award (LA) the category of Best Performance in a TV Comedy Series. Cooley has also appeared in the 2007 film The Tracey Fragments with Ellen Page. In 2012, Cooley guest starred in a YouTube miniseries called Millie and Midge, in episodes 2 and 4 as Parker.
Cooley appeared on Degrassi as a regular character in 2001, in the first season of the show and continued his role until 2007, while the show was in its sixth season. The writers decided to introduce the concept of a leading character death. At Liberty's birthday party there were two Lakehurst students urinating on his car. After J.T. confronted them, he stated, "You people slay me with your humor" before one of them stabbed him and he died. Eventually Lakehurst merges with Degrassi after Lakehurst burns down and almost everybody is unhappy that Lakehurst is there despite J.T.'s killer being in jail.
- 2000: The Color of Friendship as Billy
- 2001: "Queer As Folk" as Hank Cameron
- 2001—2006: Degrassi:The Next Generation as "J.T." Yorke
- 2014: BeyWarriors: BeyRaiderz as Task Landow