Matt Hullum (born September 29, 1974) is an independent filmmaker in Austin, Texas. Along with Burnie Burns, he is a co-founder of Rooster Teeth Productions, a company that specializes in machinima, the art using engines from computer and video games to create films. In the Red vs. Blue series, he voices Sarge, Doc and Wyoming. He also voices the Commissioner in the Grifball Mini-Series and the Red vs. Blue special The Best of Red vs. Blue Awards.
According to news posts and forum discussion on the Rooster Teeth website, he appears to handle most (if not all) of the animation of The Strangerhood. Also, according to Burnie Burns, "He is the closest we get to actual voice acting." Most of the other voice actors only use their ordinary voice, whereas Matt uses his ordinary voice in addition to other strange accents. As a result, he is responsible for a large amount of the voice acting in the various machinima projects at Rooster Teeth. According to the RT Comics, he in fact, drinks a great amount of coffee everyday.