"I’ve always liked to read about extremely wealthy people, especially when they are crazy (like Howard Hughes or Caligula.) While writing this book I did a lot of fun research on robber barons like Rockefeller and Morgan. But the most helpful stuff came from studying royal families and mad emperors. The best book I read was probably A King’s Own Story, which is the memoir of Edward VIII. Also, anything about Ivan the Terrible or Ted Turner."