Robert A. Caro is the author of The Power Broker: Robert Moses and the Fall of New York, the 1975 winner of both the Pulitzer Prize for Biography and the Francis Parkman Prize of the Society of American Historians, which is awarded to the book that “best represents the union of the historian and the artist.” The Power Broker was both an extraordinary biography and an explanation of how political power has been exercised in American cities in this century. In his new biography, The Years of Lyndon Johnson—which will be published in three volumes by Knopf beginning next fall—Caro again describes the intermingling of personality and politics and examines the exercise of power, this time at the national level. Over the course of the next year, The Atlantic will publish five articles drawn from Volume I.