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Ryan Lee Stiles (born April 22, 1959) is an American-Canadian actor, comedian, and producer whose work is often associated with improvisational comedy. He is best known for his work on Whose Line Is It Anyway?, both the original British version and the subsequent American version, and for his role as Lewis Kiniski on The Drew Carey Show. He also played Herb Melnick on the CBS comedy Two and a Half Men and was a performer on the show Drew Carey's Improv-A-Ganza. Wikipedia