The term 'Casting Leader' can be summarized as a person who is responsible for the selection of actors for a production. This person is also known as a 'POD', which stands for 'Person of Designation'. The Casting Leader is responsible for finding the right actors to fit the roles in a production, and they are also responsible for negotiating contracts with the actors. They must have a good understanding of the production and the characters in order to make the best decisions.