Selected Glenn Howerton film and TV show credits:
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Glenn Franklin Howerton III (born April 13, 1976) is an American television and film actor. He is best known for his role as Dennis Reynolds on FX's It's Always Sunny in Philadelphia (on which he is also a writer and executive producer). He also played Corey Howard on the short-lived 2002 sitcom That '80s Show and appeared in the 2008 horror film The Strangers.