A casting assistant works on set with casting directors and prospective talent. As a casting assistant in the entertainment industry, you help select actors for movies and films. Your responsibilities include reading the script and helping brainstorm which actors and actresses will suit each role. However, because the casting director and casting associate are your superiors, you may also spend time tending to administrative tasks and other on-set needs. Your duties can include serving as a liaison between actors and hiring managers, making phone calls to celebrity agents, and tracking talent availability and interest.