William L. Langer

William L. Langer
William L. Langer
	Langer in 1946
Chief of Research and Analysis Branch of OSS
	In office; 1943–1945
Preceded by	James Phinney Baxter III
Succeeded by	Office Abolished
Personal details
Born	April 16, 1896; Boston, Massachusetts, U.S.
Died	December 26, 1977 (aged 81); Boston, Massachusetts, U.S.
Spouses	Susanne Katherina Knauth, philosopher (Sept. 3, 1921–div. 1942) *Rowena Morse Nelson (Apr. 9, 1943–1975);
Relations	Rudolf Ernest Langer (elder brother); Walter Charles Langer (younger brother);
Children	2
Education	Harvard University (BA, PhD)
Occupation	academic historian, intelligence analyst, policy advisor
Military service
Allegiance	United States
Branch/service	United States Army
Years of service	1917–1919
Rank	Sergeant
Unit	Company E; 1st Gas Regiment; United States Army Chemical Warfare Service;
Battles/wars	World War I Battle of Saint-Mihiel; Meuse–Argonne offensive; ;

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William Leonard Langer (March 16, 1896 – December 26, 1977) was an American historian, intelligence analyst and policy advisor. He served as chairman of the history department at Harvard University. He was on leave during World War II as head of the Research and Analysis Branch of the Office of Strategic Services (OSS). He was a specialist on the diplomacy of the periods 1840–1900 and World War II. He edited many books, including a series on European history, a large-scale reference book, and a university textbook.