He started work every day at 5 a.m.; liked chatting with old friends in barbershops and luncheonettes and, four years ago, finally built a garage. Until then he had been scraping the snow and ice off his windshield himself. Though he was a billionaire, he had no driver.
Mr. Cook fit no obvious category. He sometimes drove the bus that took his friend, the singer John Mellencamp, on tour.