About:
Pat O'Brien (born William Joseph Patrick O'Brien) was an American stage, screen, radio, and television actor. He was a star during the first several years of his film career, the height of his popularity being during the 1930s and 1940s.

• Known For
• 
  Some Like It Hot
  as
  Detective Mulligan
• 
  American Madness
  as
  Matt Brown
• 
  Angels with Dirty Faces: Whaddya Hear? Whaddya Say?
  as
  Self (archive footage)
• 
  My Mistake
• 
  Riff-Raff
  as
  Dan Hammer