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Robert McElhenney III ( MAK-əl-hen-ee; born April 14, 1977) is an American actor, writer, producer, podcaster and businessman. He is best known for his role as Ronald "Mac" McDonald on the FX/FXX comedy series It's Always Sunny in Philadelphia (2005–present), a show he co-created with Charlie Day and Glenn Howerton and on which he continues to serve as an executive producer and writer. He is also known for playing Ian Grimm on the Apple TV+ comedy series Mythic Quest (2020–present), which he co-created with Day and Megan Ganz as executive producers.
In September 2020, McElhenney became the co-owner of the Welsh football club Wrexham A.F.C. with Ryan Reynolds; this was covered in the FX sports documentary series Welcome to Wrexham (2022–present), on which he is one of the executive producers.