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→‎Biography: DN resolved using Polish Wiki
Born in [[Warsaw]], Zygmund obtained his Ph.D. from [[Warsaw University]] (1923) and became a professor at [[Stefan Batory University]] at [[Wilno]] (1930–39). In 1940, during the [[World War II]] occupation of Poland, he emigrated to the [[United States]] and became a professor at [[Mount Holyoke College]] in [[South Hadley]]. From 1945 until 1947 he was a professor at the [[University of Pennsylvania]], and from 1947 at the [[University of Chicago]].
He was a member of several scientific societies. From 1930 until 1952 he was a member of the Polish [[SocietyWarsaw ofScientific Friends of ScienceSociety]]{{disambiguation needed|date=November 2013}} (''TNW''), from 1946 a member of the [[Polish Academy of Learning]] (''PAU''), from 1959 a member of the [[Polish Academy of Sciences]] (''PAN''), and from 1961 a member of the [[National Academy of Science]] in [[Washington, D.C.]]. In 1986 he received the [[National Medal of Science]].
His main interest was [[harmonic analysis]]. He wrote in Polish what soon became, in its English translation, the standard text in analysis, the two-volume ''[[Trigonometric Series]]''. His students included [[Alberto Calderón]], [[Paul Cohen (mathematician)|Paul Cohen]], [[Nathan Fine]], [[Józef Marcinkiewicz]], [[Victor L. Shapiro]], [[Guido Weiss]], and [[Elias M. Stein|Elias Stein]]. He died in [[Chicago]].