Colson Whitehead, a native New Yorker, won back-to-back Pulitzer Prizes for “The Underground Railroad” and “The Nickel Boys.” His most recent novels, which together constitute his Harlem Trilogy, are “Harlem Shuffle,” “Crook Manifesto,” and “Cool Machine.” This summer, the New Yorker staff writer Julian Lucas wrote an eight-thousand-word Profile of Whitehead, following him from a Manhattan bench with his name on it to his East Hampton home and a reading in Wyoming, ultimately shining light on the man that Time magazine called “America’s Storyteller.” At the twenty-seventh annual New Yorker Festival, Lucas returned for a deeper conversation with the award-winning writer.