Paul E. Klopsteg
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Paul Ernest Klopsteg (May 30, 1889 – April 28, 1991) was an American physicist.
He performed ballistics research during World War I at the US Army's Aberdeen Proving Grounds in Maryland. After the war he applied his knowledge of ballistics researching archery.
He was director of research at Northwestern University Technical Institution. From 1951 through 1958 he was an associate director of the National Science Foundation and was president of the American Association for the Advancement of Science from 1958 through 1959.