How many movies have Doug Mertz and George A. Romero collaborated on?

They have worked on 1 movie together! Their first movie together was Dawn of the Dead (1978) and was their highest rated movie together. They have not worked together since Dawn of the Dead (1978).

Dawn of the Dead (1978)

Role
Preppie Zombie - 2nd Pie-In Face
Crew
Director
Crew
Screenplay
Crew
Editor
Role
TV Director / Biker (uncredited)