Todd Gilchrist “A great man doesn’t seek to lead; he’s called to it.”This is the line spoken by Duke Leto Atreides (Oscar Isaac) to his son Paul (Timothée Chalamet) in “Dune,” Denis Villeneuve’s adaptation of Frank Herbert’s iconic science-fiction novel. But it also underscores the remarkable journey that Mary Parent, vice chairman of Worldwide Production for Legendary and one of the film’s producers, took to become one of the most successful and respected executives in Hollywood.As its Oct.