Rob McElhenney
Robert Dale "Rob" McElhenney (/ˈmækɨl.hɛni/; born April 14, 1977) is an American actor, director, producer, and screenwriter. He is best known for playing Mac on the FX comedy series It's Always Sunny in Philadelphia. He is a creator, developer, and executive producer of the show, which has also provided him with writing and directing credits on various episodes.