Glenn Howerton

Glenn Franklin Howerton III is an American actor. He is best known for playing Dennis Reynolds on the long-running sitcom It's Always Sunny in Philadelphia (2005–present) on FX/FXX, a series he co-developed with Rob McElhenney, and on which he serves as an executive producer and writer. On film, he is best known for his portrayal of Jim Balsillie in the Canadian film BlackBerry (2023), for which he received widespread critical acclaim.

His other notable performances on television include Corey Howard in That '80s Show (2002), Cliff Gilbert on Fox's The Mindy Project (2012–2017), Don Chumph on the first season of FX's Fargo (2014) and Jack Griffin, the lead role on NBC's A.P. Bio (2018–2021). He also voices Fred Jones in the HBO Max series Velma (2023–present).

Howerton also co-hosted The Always Sunny Podcast with his fellow co-creators McElhenney and Charlie Day from 2021 to 2023, when the podcast went on indefinite hiatus.