Casting Director
1. The person who auditions and helps to select all of the speaking role actors in film, television shows or plays. The Casting Director must possess a vast knowledge of the actor pool and be able to match a variety of actors with just the right role. Directors and producers rely on the Casting Director to assist them with assembling the perfect cast for their production.
Casting Directors are also responsible for serving as the liason between the director, and the actors and their agents. CDs negotiate the deals with agents once the actors have been cast and are also responsible for the contracts and SAG of each actor.
Source: Ldsfilm