Dekker has produced two albums, Psyanotic and Protean. He has previously acted on the television series Heroes.
Thomas' mother is a concert pianist, and his father is an artist, opera singer, and actor.
Filmography in Terminator franchise
- Young Artist Award — Best Performance in a TV Comedy Series — Leading Young Actor (Honey, I Shrunk the Kids: The TV Show) (1997)
- Young Artist Award — Best Performance in a Voice-Over: TV/Film/Video — Young Actor (An American Tail: The Mystery of the Night Monster) (1999)
- Young Artist Award — Best Performance in a TV Series — Guest Starring Young Actor (Boston Public) (2000)
- Young Artist Award — Best Performance in a Voice-Over Role (The Land Before Time IX: Journey to the Big Water) (2002)
- In addition to Terminator: The Sarah Connor Chronicles, Thomas Dekker and Lena Headey also costar in the film Whore and Laid to Rest.
- In the film Whore, which is directed by Thomas Dekker, Lena Headey portrays the mother of Dekker's character, just like she did in Terminator: The Sarah Connor Chronicles.