born in Los Angeles, California, the older son of Lana (née Ocampo), a hairdresser,Larry Heying, a voice-over actor.Keegans mother is Colombianhis father is from Nebraska.Keegan has a younger brother, Casey (born June 12, 1980), who is also an actor.
He is perhaps best known for his roles in films such as 10 Things I Hate about You (1999), The Broken Hearts Club (2000)O (2001). He had recurring roles on several television series, including Full House, Party of Five, 7th Heaven, Related, Step By Step, Sabrina The Teenage WitchThe Ama Show,was a regular in the final season of Thunder Alley. He also starred as Zack Dell in the movie Camp Nowhere (1994)had a small role in Independence Day (1997) He also played Dan Foster in "The Skateboard Kid 2" (1995).
Keegan is also a member of post-pop/punk trio, "The Gaze." They are currently in the studio, crafting their third album, "The Tuna-Can Chronicles." Keegan plays the drumssings back-up vocals. Keegan is a surfing instructor in his spare time.