Correspondence, diaries, writings, notes, scrapbooks, photographs, and other papers relating to Leahy's naval and diplomatic career. Documents his career as chief of the Bureau of Ordnance, commander of the Destroyer Scouting Force, chief of the Bureau of Navigation, admiral commanding the Battle Force, governor of Puerto Rico, ambassador to France (1940-1942), and Chief of Staff during and after World War II. Includes correspondence and production materials relating to the publication of Leahy's book, I was there; the personal story of the Chief of Staff to Presidents Roosevelt and Truman, based on his notes and diaries made at the time (1950); and copies of two letters (1945 June 12) from President Truman to Joseph Edward Davies relating to Davies' talks with Winston Churchill and Anthony Eden prior to the Potsdam Conference. Correspondents include Bernard M. Baruch, François Darlan, Joseph C. Grew, Cordell Hull, George C. Marshall, H. Freeman Matthews, Philippe Pétain, Franklin D. and Eleanor Roosevelt, Harry S. Truman, and Sumner Welles.