Masi Oka is a former employee of Industrial Light & Magic, where he was a digital and visual effects artist working on the Star Wars prequels. He was responsible for the effects involved in creating Geonosis's rings in Star Wars: Episode II Attack of the Clones.
Oka is also an actor; he starred in the NBC television series Heroes as the time and space-bending Hiro Nakamura.
Star Wars work
Sources
A Hero's Journey: Masi Oka on StarWars.com (original site is defunct)
Stunning New Star Wars: Visions Trailer Debuts on StarWars.com (backup link)
External links
Masi Oka on Wikipedia
Masi Oka at the Internet Movie Database