All of Robert Caro's biographies are exceptional, in part...

All of Robert Caro's biographies are exceptional, in part because of Caro's fundamental ambivalence about power. He sees its necessity and use for getting things done, even as he is often repelled by watching power at close range. His masterpiece on Robert Moses, The Power Broker, describes the evolution of Moses from idealist to pragmatist as he became one of the most powerful figures in the 20th century.