There were two George F. Kennans. The first was the well-known diplomat and ambassador to the Soviet Union and Yugoslavia--a tough political realist and man of the world who gained fame as the theorist of America's Cold War "containment" strategy. This was a "persona" that Kennan adopted in order to carry out his professional responsibilities. The second, largely unknown, but real George Kennan was a writer and aesthete--a shy, lonely man who felt...