Played by Glenn Howerton
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."
Howerton is best known for playing Dennis Reynolds on FX's wildly popular and long-running series "It's Always Sunny in Philadelphia." In addition to his starring role, Howerton serves as co-creator and writer.
A true multi-hyphenate, Howerton is a graduate of the prestigious Juilliard School of Drama and began his career on stage. He has also been seen in television hits such as "The Mindy Project," the first installment of FX's original anthology series "Fargo" and Showtime's "House of Lies." His film work includes "Everything Must Go," starring Will Ferrell, and "Crank" and "Crank 2," starring Jason Statham. He also produced his first feature, "All the Wilderness," which starred Kodi Smit-McPhee.
The son of a decorated Air Force fighter pilot, Howerton was born in Japan and lived all over the world before settling with his family in Montgomery, Alabama. Howerton currently lives in Los Angeles with his wife and children.