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Charles Peckham "Charlie" Day (born February 9, 1976) is an American actor, comedian, writer, producer, and podcaster. He is best known for playing Charlie Kelly in It's Always Sunny in Philadelphia (2005–present), which he co-created with Rob McElhenney and Glenn Howerton, and on which he is also executive producer and writer. In 2011, he was nominated for a Critics' Choice Television Award and a Satellite Award for the role. He subsequently co-created The Cool Kids in 2018 and Mythic Quest in 2020, and continues to executive-produce the latter.

On film, he is best known for his performances as biologist Dr. Newton Geiszler in Pacific Rim, Dale Arbus in Horrible Bosses, and Andy Campbell in Fist Fight. He is also known for his voice roles in Monsters University and The Lego Movie film franchise (alongside Chris Pratt) and Mario franchise character Luigi in The Super Mario Bros. Movie and its sequel The Super Mario Galaxy Movie. He made his directorial debut with Fool's Paradise released on May 12, 2023, and also plays the lead role of Latte Pronto/Sir Tom Bingsley.

Biography[]

Early life[]

Day attended Pennfield School and graduated from the Portsmouth Abbey School, both in Portsmouth, Rhode Island. He attended Merrimack College, where he majored in art history and was active in the Onstagers, Merrimack's student theater organization. He graduated in 1998. In May 2014, he gave the commencement speech for Merrimack's graduating class and received an honorary Ph.D.

While still in college, Day was active in the training programs at the Williamstown Theatre Festival every summer from 1997, where he was a contemporary of actors such as Jimmi Simpson, David Hornsby, Kathryn Hahn, Justin Long and Sterling K. Brown. Day went on to play the lead role in Dead End, at the Huntington Theatre in Boston.

After graduating, Day worked on small television roles, advertisements, and voiceovers for the Independent Film Channel, and supplemented his income by waiting tables and answering phones for a telethon. In the early 2000s, he had guest and recurring appearances on television shows.

Luigi[]

In a Nintendo Direct broadcast on September 23, 2021, it was announced that Day would voice Luigi in The Super Mario Bros. Movie co-produced by Illumination. In February 2022, Charlie Day expressed interest in doing a Luigi's Mansion film and reiterated his interest in March 2023.

Day originally voiced Luigi with a New York accent during production. However, the accent was subsequently axed when directors told him was too much like a “Goodfellas” gangster. In response to the change, Day said “Alright! I think you’re wrong, but fine!”[1]

Day was announced to return as the voice of Luigi in The Super Mario Galaxy Movie in the Nintendo Direct on September 12, 2025.

Personal life[]

A skilled musician, Day can play the piano, accordion, trombone, guitar, and harmonica, and has written or improvised most of the songs featured on It's Always Sunny in Philadelphia. In 2014, he received an honorary doctorate in performing arts from Merrimack College, where he also delivered that year's keynote address. Day is married to fellow actor Mary Elizabeth Ellis in 2006 and had a child in 2011.

Gallery[]

  Main article: Charlie Day/gallery

Trivia[]

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