
Masi Oka was born in Tokyo, Japan. His parents divorced when he was one month old; he was raised in a single parent family and has never met his father. His mother moved to Los Angeles, California ,United States when he was six. At the age of eight, he appeared on CBS-TV game show Child's Play. In 1987, a twelve-year-old Oka was featured on the cover of
Time titled "Those Asian-American Whiz Kids". Though he was not featured in the article itself, he was acquainted with the photographer who conducted the shoot. He attended elementary school at The Mirmand School and graduated high school from Harvard Westlake School in 1992. He graduated from Brown University in 1997 with a Bachelor of Science degree in computer science and math. Masi also stated in an interview that he has an IQ of 189. Oka landed his first job after graduation at Industrial, Light and Magic, George Lucas's motion picture visual special effects company, with the hope of one day earning an Oscar for technical work on a motion picture. Oka was also featured in the San Francisco Chronicle with ILM co-worker Anthony Shafer in a pre-dot-com article where he echoed his desire to meld acting and technology. His first major project was co-developing a computer program to generate water effects, which was first used for
The Perfect Storm but also used in later films such as
Pirates of the Caribbean:Dead Man's Chest. He later created programs for computational fluid dynamics and surface-tracking, which have been used in multiple projects. He also worked on the Star Wars Prequel Trilogy.
Oka first tried his hand at acting in 2000. He earned a Screen Actors Guild card by

appearing in industry films, then moved to Los Angeles. ILM stipulated in his contract that he could work at its Los Angeles branch, but would have to return to their Mari County location if he did not get cast for a recurring role that season. Oka did get cast for a pilot. Although the show was not picked up, it did satisfy the contract's requirements and he was allowed to stay in Los Angeles. He decided to continue pursuing acting. He landed several guest spots and then a recurring role as Franklyn on the NBC comedy
Scrubs. He was also featured in a PS2's Shinobi commercial, with the catch phrase 'Shinobi's Back'. Oka guest starred in an episode "Dances with Couch, aired April 8, 2002. In 2006, Oka was cast for the role of Hiro Nakamura in
Heroes. Oka translates his dialogue from the show's scripts from English to Japanese; English subtitles accompany his Japanese dialogue on the show. Additionally, Oka's real voice is closer to that of "Future Hiro" than the higher-pitched voice he uses as "Present Hiro" as heard during his appearances on
Heroes. His portrayal of the role earned him a Golden Globe Award nomination that year in the "Best Supporting Actor on a TV Series" category. In addition to his work on the show, he continues to work at ILM up to three days a week as a Research and Development Technical Director, writing programs that create special effects. He played the role of Bruce in the big screen version of
Get Smart. He recently signed on to play a real estate broker who is trying to sell to Sean Wiliam Scott's character in Steve Conrad's
The Promotion.
He was named the "Coolest Geek" at the
Spike TV Guys' Choice Awards on June 13, 2007. In 2007, he presented an award with
Heroes co-star Hayden Panettiere on the 20th annual
Nickelodian Kid's Choice Awards.
Oka has a 20-second spot in
Austin Power's in Goldmemberwhen he states that "Due to international copyright laws it, in fact, is not. [Godzilla]". He appeared on Jay Leno January 3, 2007 surprising Justin Timberlake with a funny homage to his SNL video, Dick in a Box.

Oka is fluent in Japanese, English and Spanish. His hobbies include kendo where he carries the rank of shodan. playing video games, watching and writing romantic comedies, playing the paino, beatboxing, and singing. He avidly collects manga; his current favorites include
EyeShield 21,
One Piece and
PLUTO, and he professes to be a big fan of Naoiki Urasawa's other works. In 1988, he placed fourth in the California state Mathcounts competition, and was one of the four students to represent the state of California in the national competition.