Jonathan Kimble J. K. Simmons (born January 9, 1955) is an American actor. He is best known for his roles on television as Dr. Emil Skoda in NBCs Law & Order (and other shows in the Law & Order franchise), Assistant Police Chief Will Pope in TNTs The Closer, neo-Nazi Vernon Schillinger in the HBO prison drama Oz, on film as J. Jonah Jameson in Sam Raimis Spider-Man trilogy and the upcoming animated series Ultimate Spider-Man, Mac MacGuff in Juno, as the voice of Cave Johnson in Portal 2 and being the most recognizable that guy actor. In 2011, Simmons appeared on the Adult Swim series NTSF:SD:SUV::. He is now the voice of Tenzin, Aangs youngest son, on the Nickelodeon show The