- The son of a fighter pilot; spent his early childhood in London and South Korea before moving to Montgomery, AL, with his family at age 10.
- Acted in plays at the Alabama Shakespeare Festival before attending the New World School of the Arts in Miami (after deciding against pursuing a career in aeronautical engineering).
- Made TV debut in the 2002 TNT movie Monday Night Mayhem, playing sports-TV executive Dick Ebersol.
- Met fellow It's Always Sunny executive producers Charlie Day and Rob McElhenny in New York; in Los Angeles, they began work on It's Always Sunny on TV as a "home movie," prompting FX to invite them to make a formal pilot.
- Has done voice-over work on Seth MacFarlane's American Dad and The Cleveland Show.
- Janice Howerton — Mother
- Courtney — Sister
- Jill Latiano — Wife
- Glenn Franklin Howerton Jr. — Father
- Miles Robert Howerton — Son
- Isley Ray Howerton — Son
- The Juilliard School, New York, New York, United States (BFA in Drama, 2000)
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- Birth Name: Glenn Franklin Howerton III
- Birth Place: Japan
- Birthday: April 13, 1976, Aries
- Profession: Actor, Writer, Producer
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