Which actors and actresses are the most selective over their film roles?

Often a director gets all the credit for a great movie. But as we’ve explored this week with our “How to Make a Movie” series, many important jobs contribute to the making of a masterpiece. Which brings us to casting directors, the people whose job it is to know the strengths and weaknesses of an entire landscape of actors, both discovered and un-, and then convince a director that one of them is perfect for his or her film.