Rob McElhenney was born on April 14, 1977 in Philadelphia, Pennsylvania, USA as Robert Dale McElhenney. He is a writer and actor, known for It's Always Sunny in Philadelphia (2005), It's Always Sunny in Philadelphia: It's Always Sunny on TV (2004) and It's Always Sunny in Philadelphia Season 3: Meet the McPoyles (2008). He has been married to Kaitlin Olson since September 27, 2008. They have two children.