How many movies have James T. Mack and William H. O'Brien acted in together?

They have worked on 4 movies together! Their first movie together was Anna Christie (1930) while their highest rated movie together was Citizen Kane (1941). They have not worked together since Citizen Kane (1941). They are most known for their drama films together.

Role
Prompter (uncredited)
Role
Secretary (uncredited)
Role
Thomas, Legendre Butler (uncredited)
Role
Waiter at Gaerste Party (uncredited)
Role
Johnny the Harpist
Role
Waiter at Coney Island (uncredited)