Robert Dale "Rob" McElhenney (/ˈmækɨl.hɛni/; born April 14, 1977) is an American actor. He is best known for his role as Mac on the FX series It's Always Sunny in Philadelphia. He is also credited as creator, developer, and executive producer of the show, which has also provided him with writing and directing credits on various episodes.
- Actor-Shared Background: much like Mac, he grew in an Irish Catholic family in South Philadelphia.
- Dyeing for Your Art: He gained 50 pounds to play 'Fat Mac' in Season 7 of It's Always Sunny in Philadelphia, to prove a point about sitcoms where the characters don't change appearance or get 'worse' as they age.
- Has Two Mommies: was partly raised by two gay mothers in a domestic partnership.
- Romance on the Set: He's married to his co-star Kaitlin Olson.