Ryan Lee Stiles (born April 22, 1959) is an American actor, comedian, director, and voice actor whose work is often paired with improvisational comedy. He is best known for his improv and co-production work on the American and British versions of "Whose Line Is It Anyway?" and the role of Lewis Kiniski on "The Drew Carey Show". He 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".