Educated at Dartmouth and Harvard, Day (1883-1951) was instructor in economics at Dartmouth (1919) and at Harvard, where he became assistant professor and professor (1910-23); later he was dean and professor of economics at the University of Michigan (1923-28), director for the Social Sciences of the Rockefeller Foundation (1928-37) and at the General Education Board (1930-37), and director of the National Bureau of Economic Research (1938-42).
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