The New Yorker's Steve Coll, author of Private Empire: ExxonMobil and American Power, explains how America's largest corporation wields its power within and without, and how it has stayed on top for over a half century. After the Exxon Valdez spill, the corporation placed an intense focus on rules and regulations, trying to eliminate the possibility of human error. At the same time, many of its operations take place in the world's least stable and poorest countries. Coll explains how ExxonMobil negotiates the tension between risk and profits--and how its energy policy has become American energy policy by proxy.