Career
He is the younger brother of That "70s Show cast member Danny Masterson. Masterson played Geoff in the direct-to-video movie Dragonheart: A New Beginning in 2000. The movie is a sequel to the award-winning movie Dragonheart starring Dennis Quaid and Sean Connery.
Masterson is best known for playing the character of trouble-making Francis in the award-winning sitcom Malcolm in the Middle.
He took on the role for six years, from 2000–2006. In 2003 he played Edward Linton in Music Television"s Wuthering Heights.
Masterson was also a lead character in the films Scary Movie 2, Waterborne, Made for Each Other and Intellectual Property. In the United States of America Network television series White Collar, he played Josh Roland in the episode "Where There"s a Will".
He also played Scotty O"Neal in the movie My Best Friend"s Wedding.
In 2012, Masterson had a guest role on the Turner Broadcasting System series Men at Work as a concierge named Archie.