Thomas started his acting career at the age of six from the American television show The Young and the Restless in the role of Philips Chancellor IV in the year 1993. Since then Dekker has worked in Star Trek: Voyager, Touched by an Angel, Run of the House, Reba, Heroes, Terminator: The Sarah Connor Chronicles, The Secret Circle and Back storm. Some of his notable works in the field of filmography are Star Trek Generations, Simple Joys, Whore, Kaboom, The Good Lie, Waiting for Superman and Squatters. Till now Thomas has won various Young Artist Award for the best performance in comedy series, voice over, television series and voice over role in the year 1997, 1999, 2000 and 2002 respectively.
While talking about his personal life, this vegan actor has become the victim of sexual molestation many times since his childhood days. During his teenager days, Thomas has been arrested five or six times in Las Vegas. Moving towards his love life, Thomas Dekker girlfriend was an actress Sydney Freggiaro. Dekker was linked with Sydney since 2008 but later the duo got separated. But the exact duration of their dating is not available in the internet. After few years, there was a gossip in the town about Thomas Dekker dating an American actress, model and beauty pageant titleholder Shelley Hennig as they meet in the set of The Secret Circle in the year 2012. But there is no confirmation news about their relationship.