You might have never heard of him, yet possibly you've seen him around on various episodes of crime shows, or Lyle the intern on THE DAVID LETTERMAN SHOW.
Jimmi has been in movies since 2000. His first movie was LOSER, and he was quite the character in that movie. He doesn't always play the nice guy. Yet, he can sometimes be the hottest geek in Hollywood.
Jimmi might remind you a little of James Spader, yet there is something about him that might remind you of Christian Slater too.
Simpson is also married to actress Melanie Lynskey, who you might remember from 2 and Half Men.
Come spring you can catch Jimmi Simpson a new season on A & E of BREAKOUT KINGS. The premise is a squad of U.S. marshals team up with cons (former fugitives) to work together on tracking down prison escapees in exchange for getting time off their sentences. It also stars Domenick Lombardozzi, Brooke Nevin and Serinda Swan.