The Screenwriter writes the film’s script. Screenwriters may also come up with the film’s concept or story, although often screenwriters are hired to write a script based the producer or director’s concept or story.
The Director manages the shooting of the film script, including staging scenes and directing actors. Because directors control the film’s creative vision, they also have a key role in casting, production design, and other creative aspects of the film production. Some directors are involved with script rewrites before the shoot begins, and editing after the shoot has ended.
Producers have various responsibilities depending on the type of producer.
Executive Producers pitch the film’s concept to a studio, and if the studio green lights the film, often handle such business matters as contracts and budgets.
Producers oversee the entirety of film preproduction, production and postproduction.
Supervising Producers supervises the creative process of screenplay development.
Line and Associate Producers manage the day-to-day aspects of film production.
Coordinating Producers manage the schedule and production teams.
Post Producers manage the postproduction process, including editing, music and special effects.
For a television show, the roles are slightly different in that the show’s producers are responsible for the overall creative vision of the entire show and often write the episode scripts. A television show director is usually only responsible for the filming or taping of a single episode.
– David Mullich