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. To find out how to do the job, we talked to two veteran casting directors: Ellen Lewis, who has cast such movies as Forrest Gump, The Devil Wears Prada, and every Martin Scorsese movie since Goodfellas; and Lora Kennedy, executive vice-president of feature casting at Warner Bros., whose extensive credits include Argo and Man of Steel.

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