October 14, 1869, is the birthdate of Joseph Duveen, the head of a small but lucrative art-gallery empire who administered the sale of countless art treasures from Europe to some of America’s wealthiest businessmen. So prodigious were Duveen’s promotional skills, and so far was he willing to go to make a sale, that in his day he was almost as well known as some of his clients, people with names like Morgan,...