Glenn Howerton is an American actor, producer, and writer, best known for his role as Dennis Reynolds on the popular television series It's Always Sunny in Philadelphia. Born on April 13, 1976, in Japan, he grew up in various places due to his father's military career. Howerton studied at Tulane University and later earned a Master of Fine Arts degree from The Juilliard School. In addition to his work on It's Always Sunny in Philadelphia, Howerton has appeared in other television shows, including Fargo and A.P. Bio. He has also lent his voice to animated series like Family Guy. His diverse career showcases his talent in both comedic and dramatic roles.