WILLIAM L. LANGER is the Archibald Cary Coolidge Professor of History, Emeritus, at Harvard University. In this memoir he traces his career from his boyhood with immigrant parents through the education that led him to an early professorship at Harvard and to the writing of a number of authoritative works in diplomatic history, such as The Diplomacy of Imperialism. He has also edited An Encyclopedia of World History (now in its fifth edition) and the twenty-volume series The Rise o f Modern Europe. His recognized position in tht field of international relations led to his call to Washington even before Pearl Harbor and to five years of service as the chief of the Research and Analysis Branch of Donovan's Office of Strategic Services and later as special assistant for Intelligence to the Secretary of State. His wartime contribution to the development of foreign intelligence won him the award of the Medal for Merit by President Truman and to an honorary degree by Harvard and later by Yale. In the post-war period Mr. Langer again divided his time and efforts between teaching and government service. He took an active part in organizing the National War College and returned to Washington in 1950 to set up the Office of National Estimates in the Central Intelligence Agency. Eventually, in 1961, he was invited by President Kennedy to join the President's Foreign Intelligence Advisory Board, a position from which he resigned only in 1969. Mr. Langer, for all his activities and responsibilities, was never forgetful of the lighter side of life. As an adult he took up the study of the viola and after several years of systematic study played regularly as a member of an amateur quartet. Always devoted to the outdoors, he loved gardening at his summer home overlooking Ipswich Bay and never really abandoned hope of some time defeating his wife at golf or candlepin bowling.