McElhenney at the 2013 San Diego Comic-Con International
|Born||Robert Dale McElhenney
April 14, 1977
Philadelphia, Pennsylvania, U.S.
|Occupation||Actor, director, producer, screenwriter|
Robert Dale "Rob" McElhenney (//; 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.
McElhenney was born in Philadelphia, Pennsylvania.  As a child, he liked to play tennis and racquetball. He attended St. Joseph's Preparatory School and excelled in his studies, particularly math and science.
McElhenney made his film debut with a small part in Alan J. Pakula's The Devil's Own, followed by small parts in A Civil Action, Wonder Boys, and Thirteen Conversations About One Thing. He later had more substantial parts in Latter Days and The Tollbooth, and a small role in the Law & Order episode "Thrill".
In 2004, McElhenney was still waiting tables between acting assignments when his manager and agent pitched his idea for a sitcom to FX, which was warmly received. McElhenney claims that 50 weeks of each year are consumed by acting, producing, and writing for the show, but he did find time to appear in the third season of Lost in the episode "Not in Portland". This was a result of McElhenney meeting Lost co-creator and executive producer Damon Lindelof, who is a fan of It's Always Sunny in Philadelphia. McElhenney continued the role in Lost, featured again in the sixth season for a single episode. Rob is a fan of Game of Thrones and was thrilled that the series' writers asked to write an episode of It's Always Sunny in Philadelphia. He and his co-producers accepted the offer. 
McElhenney married his It's Always Sunny in Philadelphia co-star, Kaitlin Olson, in California on September 27, 2008. In 2009, the couple announced their purchase of Skinner's Bar at 226 Market Street in Philadelphia ( ). It was renamed Mac's Tavern. They had their first child, Axel Lee McElhenney, on September 1, 2010. Olson went into labor at a Philadelphia Phillies game. The couple's second son, Leo Grey McElhenney, was born on April 5, 2012.
In preparation for the seventh season of It's Always Sunny in Philadelphia, McElhenney put on 50 lbs of extra weight and let his beard grow out to give extra humor to his character and add a new comedic direction for the season. His co-star Charlie Day described the weight gain as "disgusting" and that the rest of the cast were "a little on the fence about it for his own personal health and safety". McElhenney subsequently lost 23 lbs in a month after the season was finished filming. He lost more later in the year to film the next season.
|1997||The Devil's Own||Kevin|
|1998||A Civil Action||Teenager on Property|
|2001||Thirteen Conversations About One Thing||Chris Hammond|
|2002||Long Story Short||Trent|
|2003||Latter Days||Elder Harmon|
|2004||The Tollbooth||Simon Stanton|
|2012||Living Loaded||Television film|
|1997||Law & Order||Joey Timon||Episode: "Thrill"|
|2004||ER||Andy Fesh||Episode: "Where There's Smoke"|
|2005–present||It's Always Sunny in Philadelphia||Ronald "Mac" McDonald||114 episodes
Creator, writer, director, producer
|2007–2010||Lost||Aldo||3 episodes: Not in Portland, What Kate Does, Lighthouse|
|2014||The Mindy Project||Lou Tookers||Episodes: "We're a Couple Now, Haters", "Christmas"|
- "The Actors Lounge interviews Charlie Day". Retrieved 2010-10-20.
- "“It’s Always Sunny in Philadelphia’s” Rob McElhenney talks about upcoming “gay marriage” episode". Greg in Holywood magazine. Aug 7, 2010.
- "McElhenney interview". Retrieved 2007-11-03.
- Huffington Post, Retrieved January 2, 2015
- "OK! Exclusive: Kaitlin Olson & Rob McElhenney Wed". OK!. 2008-10-01. Retrieved 2008-10-12.
- "Mac and Dee from "Always Sunny" getting into bar business for real | Philadelphia Inquirer | 12/17/2009". Philly.com. 2009-12-17. Retrieved 2011-11-16.
- "Kaitlin Olson, Rob McElhenney Welcome Son Axel Lee". People.com. 2010-09-02. Retrieved 2010-09-02.
- Johnson, Zach. "Meet Kaitlin Olson and Rob McElhenney's Son Leo Grey!". US Weekly. US Magazine. Retrieved 1 August 2012.
- "Fat Mac: Rob McElhenney Goes Into Graphic Detail About 'Sunny' Weight Gain". Reuters. 2011-08-10.
- Maerz, Melissa (2011-09-16). "Rob McElhenney: How To Get Fat for TV". TV Article (Entertainment Weekly). Retrieved 2 November 2011.
|Wikimedia Commons has media related to Rob McElhenney.|
- Rob McElhenney at the Internet Movie Database
- "One on one with the guys from Always Sunny in Philadelphia", HoboTrashcan.com.
- "Rob McElhenney interview on the Best Damn Sports Show Podcast"
- "Rob McElhenney interview on the WTF with Marc Maron Podcast"