How many movies have Debra Hill and Marc Ross collaborated on?

They have worked on 1 movie together! Their first movie together was Assault on Precinct 13 (1976) and was their highest rated movie together. They have not worked together since Assault on Precinct 13 (1976).

Assault on Precinct 13 (1976)

Crew
Script Supervisor
Role
Patrolman Tramer
Crew
Assistant Editor