His movie highlights include 1999’s The Deep End of the Ocean, which received praise from both The New York Times and Roger Ebert from The Chicago Sun Times. His appearance in three John Hughes’s films: The Breakfast Club, Sixteen Candles, and Weird Science earned him fame in the 1980s as a character actor.
Other film works include Schepisi’s Roxanne, with Steve Martin and Daryl Hannah, and Garry Marshall’s Nothing in Common, opposite Tom Hanks, and Touchstone’s Stick It show his improvisational and comedic timing skills. Whereas roles in The Boost, with James Woods, and Internal Affairs with Richard Gere, present his adaptability for dramatic roles.
Kapelos has also worked on television in shows such as Miami Vice as a corrupt public defender, Desperate Housewives, Queer as Folk, The X-Files, Seinfeld, Home Improvement, Dead Like Me, ER, and Boston Legal.
Kapelos also guest teaches at the AIA Studios focusing on improv/acting workshops; produced a four-part series on YouTube featuring monologues by NPR-contributor Michael Raysses called Greek to Me, and manages an independent record labeled called Carpuzi Records, which has produced sound recordings featuring him and some of the Second City alumni, such as Dan Castellaneta. He has recently been in an episode of the new television series Nikita, playing a security guard. It was filmed at the University of Toronto.