Having interviewed more than 260 people and consulted some 100,000 documents, Gopnik succeeds in establishing the chronology and tracing the fine lines of Warhol’s many succeeding interests, decisions, departures, whims and relationships of all sorts. Few artists’ biographies can have recorded so many changes — in style, stance and social milieu — occurring often on a week-to-week basis for some 35 years, amounting to a density of information more akin to, say, military history. We will all find our favorite Warhol avatar, of the hundreds on offer, somewhere within these pages.