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After the war, Hapgood taught at Keystone College (1945–1947), Springfield College (1947–1952), Keene State College (1956–1966), and New England College (1966–1967), lecturing in world and American history, anthropology, economics, and the history of science.
is the Cohen Chair of Holocaust and Genocide Studies at Keene State College located in Keene, New Hampshire.