From 1966 to 1970, he was U.S. Alternate Executive Director for the International Bank for Reconstruction and Development (World Bank), the International Development Association, and the International Finance Corporation.
After military service during the war, he was managing director of Barings between 1949 and 1959 He then served as Economic Minister at the British Embassy in Washington as well as holding executive directorships at the International Monetary Fund, the International Bank for Reconstruction and Development, and the International Finance Corporation.
Riddell worked with the International Bank for Reconstruction and Development in Washington from 1969 to 1971.
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He also supervised the inauguration of the International Bank for Reconstruction and Development and the International Monetary Fund, both created at the Bretton Woods Conference of 1944, acting as the first chairman of their respective boards.