Sean Masterson (born New York City) is a comedy actor, writer, director and producer most famous for his work with Drew Carey, writing on The Drew Carey Show, and an improvisational performer on Whose Line Is It Anyway? spin-offs Drew Carey's Green Screen Show, and Drew Carey's Improv-A-Ganza.Sean Masterson is a multi-faceted improvisational comedian who enjoys writing, producing, directing, and acting.