
Kenneth Leung was born in New York City in 1970. Though they first lived in the Lower East Side of Manhattan, his family moved to Brooklyn where Leung finished high school. Leung then attended college at New York University. After discovering his talent for acting in his junior year, Leung began taking classes with actress Catharine Russell, among others
After working in several minor acting troupes and stage and film productions, Leung's first big acting break came with the role of Sang in Brett Ratner's 1997 blockbuster
Rush Hour. He was noticed by actor Edward Norton, and was soon cast in Norton's 2000 directorial debut,
Keeping the Faith. Over the next few years, Leung appeared in films such as
The Family Man and Steven Spielberg's
A.I.: Artificial Intelligence. In 2004, Leung appeared in the hit horror film Saw, in which he played Detective Steven Sing. Afterwards, Leung appeared in the Spike Lee crime drama
Inside Man as a hostage in a bank heist, and in
X-Men: The Last Stand, reuniting with director Brett Ratner.
After seeing Leung's guest performance on the April 22, 2007 episode of
The Sopranos, Damon Lindlelof and Carlton Cuse mutually agreed that they wanted Leung to appear on the show. They then drafted the character of Miles Straume specifically for Leung, and contacted his agent. An audition was set up in July. To keep spoilers from being leaked, the scene used for the audition was one that did not appear in the show, but one that emulated the character that they were looking for, who was at the time named "Russell." Lindelof stated that because the character of Miles was specifically created for Leung, if he had not accepted the job then the character would have been completely changed. However, Leung accepted, and began working on
Lost in the episode "Confirmed Dead". His character was well received, and Leung was promoted to the main cast along with Jeremy Davies and Rebecca Mader. Leung went on to appear as Miles in eight episodes of the fourth season, and returned as a main cast member in season five.