 In honor of that 50th anniversary of The Power Broker, we're republishing The New Yorker's long excerpt at newyorker.com. Robert Caro, of course, went on to an even bigger project, his series of books on the life of President Lyndon Johnson. A few years ago, Caro took a break from that research to talk with me at the McCarter Theater in Princeton, New Jersey. A book of shorter pieces about his working method, a book called Working, had just been published.