Glenn Howerton On Season 2 Of The NBC Series, "A.P. Bio"
Glenn Howerton stars as Jack Griffin, a disgraced Harvard philosophy scholar who loses out on his dream job and is forced to return to Toledo, Ohio, to teach Advanced Placement biology, in the NBC comedy series "A.P. Bio," where he also serves as a producer. Howerton is best known for playing Dennis Reynolds on FX’s wildly popular and long-running series, "It's Always Sunny in Philadelphia."