Spielberg was interested in working with producer Frank Marshall. He had worked on smaller independent films, and Spielberg believed he would keep the film on schedule and budget. Spielberg also hired cinematographer Douglas Slocombe and production designer Norman Reynolds because he liked their previous works, and his long-time collaborator Michael Kahn as editor. Lucas served as a second unit director and the film's executive producer, along with his acquaintance Howard Kazanjian, whom Lucas believed would be a disciplined influence and not indulge the filmmakers' larger ambitions. Lucas brought in his long-time collaborator Robert Watts as associate producer and production manager. Paramount mandated a filming schedule of 85 days; Lucas, Spielberg, and Marshall agreed on a self-imposed 73-day schedule. Spielberg was determined to avoid criticism for another schedule overrun.