About Glenn Howerton
Glenn Franklin Howerton III is an American actor, writer, and producer. He is best known for playing Dennis Reynolds on the FX/FXX sitcom It's Always Sunny in Philadelphia (2005–present), which he co-developed and on which he serves as an executive producer and writer alongside the other main cast members. Howerton's other notable performances include Cliff Gilbert on The Mindy Project (2012–2017), Don Chumph on the first season of Fargo (2014), Jack Griffin on A.P. Howerton is best known for playing the narcissistic and sociopathic Dennis Reynolds on the FX sitcom It's Always Sunny in Philadelphia (2005–present). The series was co-created by Howerton alongside Rob Mac and Charlie Day, who all serve as producers, writers, and main cast members alongside Kaitlin Olson and Danny DeVito.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.