Rob McElhenney: Rob McElhenney. Writer: It's Always Sunny in Philadelphia. Rob McElhenney was born on 14 April 1977 in Philadelphia, Pennsylvania, USA. He is a writer and producer, known for It's Always Sunny in Philadelphia (2005), Mythic Quest (2020) and Latter Days (2003). He has been married to Kaitlin Olson since 27 September 2008. They have two children.
