Charlie Day is an American actor, producer, and writer, best known for his role as Charlie Kelly on the popular television show It's Always Sunny in Philadelphia. Born on February 9, 1976, in New York City, he graduated from Merrimack College with a degree in fine arts. In addition to his television work, Day has appeared in several films, including Pacific Rim and Horrible Bosses. He is recognized for his distinctive voice and energetic comedic style, which have made him a prominent figure in the entertainment industry.