Question: What profession did both Leni Riefenstahl and Abel Ferrara share?
Sentence (from "Biography: A Brief History"): It also examines such famous biographical authors as Plutarch, Saint Augustine, Sir Walter Raleigh, Samuel Johnson, Jean-Jacques Rousseau, Lord Byron, Sigmund Freud, Lytton Strachey, Abel Gance, Virginia Woolf, Leni Riefenstahl, Orson Welles, Julian Barnes, Ted Hughes, and Frank McCourt.
Relevant evidence: No