Donald Kagan is an American historian and classicist at Yale University specializing in ancient Greece, notable for his four-volume history of the Peloponnesian War. He formerly taught in the Department of History at Cornell University. At present, Kagan is considered among the foremost American scholars of Greek history. Source: Wikipedia
The first volume of Donald Kagan's acclaimed four-volume history of the Peloponnesian War offers a new evaluation of the origins and causes of the conflict, based on evidence produced by modern scholarship and on a careful reconsideration of the ancient texts.