Thomas B. Kin Chong aka Tommy Chong, born 24 May 1938, is a Canadian activist, actor, comedian, director, musician, writer and cannabis rights activist. He is known for his marijuana-themed Cheech & Chong comedy albums and movies with Cheech Marin, as well as playing the character Leo on Fox’s That ’70s Show. He became a naturalized United States citizen in the late 1980s.