Book excerpt: Williams' controversial volumes, The Tragedy of AmericanDiplomacy, Contours of American History, and other works have established him as the foremost interpreter of US foreign policy. Both Williams and others deeply influenced by him have recast not only diplomatic history but also the story of pioneer America's westward movement, and studies in the culture of imperialism. At the end of the Cold War, when the US no longer faces any great enemy, the lessons of William Appleman Williams' life and scholarship have become more urgent than ever before. This study of his life and major works offers readers an opportunity to introduce, or re-introduce, themselves to a major figure of the last half-century.