The casting director behind "JFK," "Natural Born Killers," and "The Rock" talks about her powerful new documentary, which follows her husband's Alzheimer's battle, and why she's happy the Academy is finally recognizing what casting directors do. Casting director Heidi Levitt has spent decades working in close collaboration with many of the most acclaimed directors of their era on some of the best — and most perfectly and audaciously cast — movies of all time. Movies like “ JFK ,” “Natural Born