Campbell had a starring role in the feature film, Tillamook Treasure (2006), in which she plays Kathryn Kimbell, the mother of the story's lead character. She has appeared on such television shows as Still Standing, Martial Law, and Herman's Head, Ally McBeal, Seinfeld ("The Frogger" episode), Friends, House M.D, The Mentalist, The Practice, The Pretender, and Dexter.[2]　　Some of her earliest notable roles were on the daytime soap operas Ryan's Hope and Santa Barbara and the comedy film Livin' Large. In 2009, she guest starred on the NBC drama Heroes as Mary Campbell, mother of a new recurring character, Luke, in the episode "Trust and Blood".　　Julia was born in Redstone Arsenal, near Huntsville, Alabama, the daughter of a model mother and an army officer father.[3] She is married to actor Jay Karnes. She appeared on the last episode of the series The Shield, as a lawyer for Dutch's partner, Steve Billings, who is instantly attracted to Dutch. She was previously married to Bernard White.