How many movies have Herbert Kerr and Robert Downey Sr. collaborated on?

They have worked on 1 movie together! Their first movie together was Putney Swope (1969) and was their highest rated movie together. They have not worked together since Putney Swope (1969).

Role
Bodyguard #2
Crew
Director
Crew
Writer
Crew
Producer
Role
Putney Swope (voice) (uncredited)