Thomas B. Kin Chong (born May 24, 1938) is a Canadian-American comedian, actor, musician and activist. He is known for his role/inspiration in the marijuana industry, his marijuana-themed Cheech & Chong comedy albums and movies with Cheech Marin, and playing the character Leo on Fox's That '70s Show. He became a naturalized United States citizen in the late 1980s. (Via Wikipedia)