Best known for playing the character Charlie Kelly on the popular FX series It's Always Sunny in Philadelphia. He also created the show and serves as a producer and writer alongside co-stars Glenn Howerton and Rob McElhenney.
He appeared in the film, Going the Distance with Drew Barrymore and Justin Long.
He starred in the comedy film Horrible Bosses opposite Jennifer Aniston.
He played shortstop on the baseball team at Merrimack College, where he also majored in Fine Arts. During college summers, he refined his acting at Williamstown Theatre Festival.
He married Mary Ellis, whom he met on the set of Reno 911. She also became a recurring character on It's Always Sunny in Philadelphia.
- The meaning of the name Day: Light And Hope