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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. Wikipedia