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Joseph Slepian (born Feb. 11, 1891, Boston, Mass., U.S.—died Dec. 1, 1969, Swissvale, Pa.) was an American electrical engineer and mathematician credited with important developments in electrical apparatus and theory. Slepian studied at Harvard University, earning the Ph.D. in 1913. After a postdoctoral year in Europe he taught mathematics at Cornell University, Ithaca, N.Y., for a year before joining the research staff of the Westinghouse Electric Company (from 1945, Corporation). There he worked for the...