Rob McElhenney, born Robert Dale McElhenney on April 14, 1977, in Philadelphia, Pennsylvania, is an American actor, screenwriter, producer, director, and businessman. He is best known for his role as Mac on the long-running FX/FXX comedy series It's Always Sunny in Philadelphia, which he co-created and developed alongside Charlie Day and Glenn Howerton. The show premiered in 2005 and has gained a loyal following, making it one of the longest-running live-action sitcoms in American television history. McElhenney's work on the series as an executive producer and writer has solidified his reputation in the entertainment industry.

Growing up in a working-class family, McElhenney developed an interest in storytelling and performance at an early age. He attended St. Joseph's Preparatory School in Philadelphia and later graduated from Temple University. After college, he began his career in the entertainment industry with small roles in various television projects. His breakthrough came when he pitched the concept of It's Always Sunny in Philadelphia, a show centered around a group of friends who run a bar in Philadelphia, often engaging in morally questionable antics. The show's unique blend of dark humor and satirical commentary quickly resonated with audiences.

In addition to his iconic role as Mac, McElhenney has showcased his versatility as an actor by portraying Ian Grimm, the lead character in the Apple TV+ comedy series Mythic Quest. The series, which he co-created with Charlie Day and Megan Ganz, premiered in 2020 and explores the inner workings of a video game development studio. McElhenney's performance has been praised for its comedic timing and depth, contributing to the show's success over its run.

Beyond his work in television, McElhenney has ventured into the world of sports. In September 2020, he became a co-owner of Wrexham A.F.C., a Welsh football club, alongside fellow actor Ryan Reynolds. This unexpected partnership captured the public's attention and was documented in the FX series Welcome to Wrexham, which premiered in 2022. McElhenney's involvement with the club reflects his passion for football and entrepreneurship, and the series has garnered critical acclaim, earning him two Primetime Emmy Awards for Outstanding Unstructured Reality Program as an executive producer.

McElhenney is married to actress Kaitlin Olson, with whom he has two children. Their relationship has often been highlighted in the media, both for their personal and professional collaborations. As he continues to work in television and explore new creative avenues, Rob McElhenney remains an influential figure in the entertainment landscape, known for his humor, creativity, and dedication to his projects.