Robert Caro’s 1974 biography “The Power Broker” is a book befitting its subject, Robert Moses — the unelected parochial technocrat who used a series of appointed positions to entirely reshape New York City and its surrounding environment for generations to come. Like Moses, Caro’s book has exerted an enduring and outsize influence. Caro recently joined The Times’s Book Review Podcast to discuss his experience writing the seminal book, and how he accounts for its continuing legacy.