He was born on September 10, 1969 in Edgewood, Maryland. He has acted in such works as How to Make an American Quilt, which earned him a Screen Actors Guild nomination, and ABC's Judas. He starred in his first major play in 2000 titled A Question for Mercy. 

Jonathon wrote one book titled Rick Dempsey's Caught Stealing, but has written and co-written numerous screenplays including stories by Miles Chapman and Stephen King.

Johnathon married fellow actress Christina Applegate in October 2001, but filed for divorce a few years later. He was again married to another actress, Jana Kramer, in 2010 but separated and consequently divorced only one year later. Jonathon has one son, Camden Quinn, with his current wife Julie Solomon.