- The youngest of six children.
- First professional acting job was in a commercial for the Illinois lottery.
- A co-creator of the web series James Gunn's PG Porn with brothers James and Brian.
- Nicknamed "The Judge," which originated from older Matt, who jokingly accused him of being judgmental.
- Has previously roomed with fellow actors Judy Greer and Gilmore Girls co-star John Cabrera.
- Appeared in the second episode of Gilmore Girls as Mick, before being brought back later in the season to play eccentric Stars Hollow resident Kirk; he eventually became a series regular.
- Mark Gunn — Cousin
- James F. Gunn — Father
- Patrick Gunn — Brother
- Beth Gunn — Sister
- James Gunn — Brother
- Matt Gunn — Brother
- Brian Gunn — Brother
- DePaul University, Chicago, Illinois, United States (1996)