William Edward Fichtner (born November 27, 1956) is an American actor. He is known for his television roles as Sheriff Tom Underlay on Invasion, Alexander Mahone on Prison Break, Carl Hickman on Crossing Lines, and Adam Janikowski on Mom. His film appearances include Heat, Contact, Armageddon, The Perfect Storm, Go, Crash, Black Hawk Down, and Teenage Mutant Ninja Turtles.