William Edward Fichtner (born November 27, 1956) is an American actor. He has appeared in a number of notable film and TV series. His best known movie roles are as Dellrayne in Hypnotic, Colonel Mulholland in 12 Strong, Mike in The Neighbor, General Adams in I...

His best known TV roles are as Leo Nicoletti on ABC's The Company You Keep, Adam Janikowski on CBS's sitcom Mom, Carl Hickman on NBC's drama Crossing Lines, Alexander Mahone on FOX's drama Prison Break, Sheriff Tom Underlay in the ABC cult series Invasion, and Dr. Bruce Kellerman on ABC's medical drama MDs.