Biography: Robert Dale "Rob" McElhenney ( born April 14, 1977) is an American film and television actor best known for his role as Mac on the FX TV series It's Always Sunny in Philadelphia. He is also credited as creator, developer and executive producer of the show, which has also provided McElhenney with writing and directing credits on… See full bio

Born: April 14, 1977 in Philadelphia, Pennsylvania, USA