Antoni Zygmund
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Antoni Zygmund (b. December 25, 1900 in Warsaw - May 30 1992 in Chicago) was a Polish mathematician, who exerted a major influence on 20th-century mathematics.
Zygmund was professor at the University of Wilno from 1930 until 1939. During the occupation of Poland (Second World War), he emigrated to USA in 1940 and became professor at the Mount Holyoke College in South Hadley. From 1945 until 1947 he was professor at the University of Pennsylvania and from 1947 at the University of Chicago.
He was member of several scientific societies. From 1930 until 1952 member of the Friends of Science Society (TNW), since 1946 member of Polish Academy of Skills (PAU), since 1959 member of Polish Academy of Sciences (PAN) and since 1961 member of the National Academy of Science in Washington.
His main interest was harmonic analysis. He wrote a standard two-volume work Trigonometric Series.