He is best known for playing Keemo Volien Abbott in the CBS soap opera The Young and the Restless from 1994 to 1996, Mr. Lee in the TV series Deadwood (2005), and the thug Woo in the 1998 Coen brothers film The Big Lebowski.
This was followed by minor roles in the TV series As the World Turns and in Peter Wang's Hong Kong crime comedy The Laser Man in which he played a soldier.
[3] In 1994, Moon appeared in the PBS miniseries Tales of the City as Lionel, the father of DeDe Halycon Day's illegitimate twins.
[6] In 1998, Moon starred alongside Jeff Bridges as Woo, one of the "Treehorn Thugs" who urinates on The Dude's rug in The Big Lebowski.
In the late 1990s and early 2000s he had a string of roles playing police officers, including the 1998 TV movie Tempting Fate, the 1998 film Love Kills, and portraying detective Steven Nimh in the series Walker, Texas Ranger opposite Chuck Norris in 2000.