However, his studies were interrupted by World War I and during the war he worked under Roger Adams in a lab set up at the university to make fine chemicals that had, until then, been imported from Germany, which at the time was the centre of fine chemical production.
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Sumner graduated from Harvard University with a bachelor's degree in 1910 where he was acquainted with prominent chemists Roger Adams, Farrington Daniels, Frank C. Whitmore, James Bryant Conant and Charles Loring Jackson.