This document discusses different types of contributors that may be involved in film pre-production, including specialists, experts, talent, and the public. Specialists are people with advanced skills hired for technical operations, training, or key production roles. Experts, such as historians, are recruited during research to ensure accuracy. Talent refers to actors and performers. The public may also contribute by allowing filming locations or appearing in crowd scenes. Biographies are often included in press materials to highlight the credentials of key contributors like specialists, experts, producers, and actors.