A film producer is a person who oversees film production. Either employed by a production company or working independently, producers plan and coordinate various aspects of film production, such as selecting the script; coordinating writing, directing, and editing; and arranging financing. During the "discovery stage," the producer finds and selects promising material for development. Then, unless the film is based on an existing script, the producer has to hire a screenwriter and oversee the development of the script. Once a script is completed, the producer will lead a pitch to secure the financial backing (a "green light") to allow production to begin. The producer also supervises the pre-production, production, and post-production stages of filmmaking. One of the most important tasks is to hire the director and other key crew members. Whereas the director makes the creative decisions during the production, the producer typically manages the logistics and business operations, though some directors also produce their own films. The producer is tasked with making sure the film is delivered on time and within budget, and has the final say on creative decisions. Finally, the producer will oversee the marketing and distribution. For various reasons, producers cannot always supervise all of the production. In this case, the main producer or executive producer may hire and delegate work to associate producers, assistant producers, line producers or unit production managers.