Sir John Cotesworth Slessor (1897-1979) was one of Great Britain's most influential airmen. He played a significant role in building the World War II Anglo-American air power partnership as an air planner on the Royal Air Force Staff, the British Chiefs of Staff, and the Combined Chiefs of Staff. He coordinated allied strategy in 1940-41, helped create an Anglo-American bomber alliance in 1942, and drafted the compromise at the Casablanca Conference that broke a deadlock in Anglo-American strategic debate.