Thomas Bing Kin Chong (born May 24, 1938) is a Canadian-American comedian, actor and musician who is well-known for his stereotypical portrayals of hippie-era stoners. He is most widely known for his involvement in the marijuana-themed Cheech & Chong comedy movies with Cheech Marin, as well as playing the character Leo on Fox's That '70s Show.

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He is a Canadian-American comedian, actor, and musician recognized for his defining contributions to counterculture comedy and voice work.
He is best known for starring in marijuana-themed comedy films alongside Cheech Marin and for playing the character Leo on television.
He specializes in improvisational stoner comedy, counterculture satire, and supporting voice roles in animated features.