J.K. Simmons is an actor who is best known for his portrayal of Dr. Emil Skoda in all three primary shows of the Law & Order franchise. Before he became a recurring character, he played Jerry Luppin in the Law & Order Season 4 episode "Sanctuary".

Simmons is also known as the sadistic prison inmate Vernon Schillinger on the prison drama Oz. He also played the obsessively egotistical newspaper editor J. Jonah Jameson in all three Spider-Man movies. He also stars as Ralph Earnhardt, the father of famous race-car driver Dale Earnhardt, in 3: The Dale Earnhardt Story. He has been praised for his portrayal of Mac McGuff, Juno's father, in Juno. Currently, he plays as the Assistant Chief of the LAPD, Will Pope in The Closer.

Simmons has also done voice work, lending his voice to shows such as Phineas and Ferb, Kim Possible, Ben 10: Alien Force, American Dad, Justice League, and The Marvelous Misadventures of Flapjack. He has also voiced characters in animated movies such as Aliens in the Attic and Megamind. His voice can also be heard as Cave Johnson in Valve's video game series Portal.

Like many of his Law & Order co-stars, he also appeared in an episode of Homicide: Life on the Street, though he portrayed a criminal suspect, Alexander Rausch, rather than his Dr. Skoda character. The Season 4 episode "For God and Country" crossed over with Law & Order before Simmons joined the cast as Skoda.


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