WILLIAM G. HYLAND was editor of Foreign Affairs from 1984 through 1992, and subsequently, was a research professor of international relations at Georgetown University's School of Foreign Service. He pursued a long career in government, with the CIA, the National Security Council Staff, and as Assistant Secretary of State for Intelligence. He is the co-author of The Fall of Khrushchev (1968) and the author of Mortal Rivals (1987) and The Cold War Is Over (1989).