Glenn Franklin Howerton III (b. 1978 in Japan) is an American actor of television and film probably best known for either his role of Dennis Reynolds on the FX TV series It's Always Sunny in Philadelphia or for the role of Corey Howard on the 2002 sitcom That 80s Show.
Howerton's father Glenn was a fighter pilot and as a result, he grew up in Korea, London and Montgomery, Alabama; he graduated from Jefferson Davis High School in Montgomery. He then graduated from the Juilliard School with a BFA in the actor training program.
Howerton also guested on ER for six episodes as Dr. Nick Cooper in 2003 and had bit parts in the films Serenity and Must Love Dogs.
