How many movies have Christopher P. Martin and George A. Romero collaborated on?

They have worked on 1 movie together! Their first movie together was The Dark Half (1993) and was their highest rated movie together. They have not worked together since The Dark Half (1993).

The Dark Half (1993)

Crew
Animatronic and Prosthetic Effects
Crew
Director
Crew
Screenplay
Crew
Executive Producer
Role
Customer (uncredited)