How many movies have Frank Welker and Matthew O'Callaghan collaborated on?

They have worked on 3 movies together! Their first movie together was The Great Mouse Detective (1986) while their highest rated movie together was The Little Mermaid (1989). They have not worked together since Curious George (2006). They are most known for their family films together.

Curious George (2006)

Role
George (voice)
Crew
Director

The Little Mermaid (1989)

Role
Max (voice)
Crew
Animation Director
Crew
Storyboard

The Great Mouse Detective (1986)

Role
Toby the Dog / Felicia the Cat (voice) (uncredited)
Crew
Screenplay