Stephen Root is an American actor, voice actor, and comedian.
In live-action, he is best known for playing Jimmy James on the TV sitcom NewRadio, Milton Waddams in the comedy film Office Space, Gordon Pibb in Dodgeball: A True Underdog Story, and for his collaborations with the Coen Brothers in The Ladykillers, O Brother, Where Art Thou?, and No Country for Old Men.
He is also notable for his many guest appearances in television, especially for Star Trek: The Next Generation in the episode Unification.
Like many others, he is a very versatile voice actor, capable of finding a voice that fits a character perfectly. His most recognized of voice roles are Bill Dauterive and Buck Strickland in King of the Hill, Bubbles the Yellow Tang Fish in Disney/Pixar's Finding Nemo, Master Junjie in Dreamworks/Nickelodeon's Kung Fu Panda: Legends of Awesomeness, and Floyd the Fly in Phineas and Ferb. Root also voiced the Sheriff of Roswell for three episodes of Buzz Lightyear of Star Command and Home Base On The X's.
For WordGirl, he guest starred as Professor Robert Tubing in the episode "A Game of Cat and Mouse", where said character helps WordGirl defeat Dr. Two-Brains by finding the weakness of him and his mouse brain.