- Born April 14, 1977 in Philadelphia Pennsylvania.
- McElhenney is primarily known for his role on It's Always Sunny in Philadelphia as Mac. He is the creator of the show, has been a writer for numerous episodes, is the producer of the show, and has directed one episode.
- He has also appeared in shows such as ER and Law & Order.
- He lived in New York for 8 years before moving to Los Angeles. While in New York he did all sorts of small acting jobs.
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