Drawing on extensive interviews with George Kennan and exclusive access to his archives, an eminent scholar of the Cold War delivers a revelatory biography of its troubled mastermind. In the late 1940s, George Kennan wrote two documents, the "Long Telegram" and the "X Article," which set forward the strategy of containment that would define U.S. policy toward the Soviet Union for the next four decades. This achievement alone would qualify him as the most influential American diplomat of the Cold War era. But he was also an architect of the Marshall Plan, a prizewinning historian, and would become one of the most outspoken critics of American diplomacy, politics, and culture during the last half of the twentieth century. Now the full scope of Kennan"s long life and vast influence is revealed by one of today"s most important Cold War scholars.