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Istvn Feny was a Hungarian mathematician, whose first name was also known as tienne, Stefan, Stephan or Stephen. He was best known for his publications of applied mathematics. He made significant contributions to analysis, algebra, geometry, integral equations and many other fields that pertain to his interests.

Istvn Feny was born onMarch 1917 in Budapest, AustriaHungary into a family who were cultured and interested in arts. He attended Pzmny Pter Catholic University in Budapest to study mathematics and physics his advisor was Lipt Fejr who was the chair of mathematics for 48 years from 1911 to 1959. After his graduation in 1939, which allowed him to teach those subjects at secondary school in Hungary, he continued his studies in chemistry and in 1942 earned the diploma. He then worked on his research publication ber die PolynomKerne der linearen Integralgleichungen in 1943. During his doctorate, he developed his thesis On the theory of mean values in 1945.

Source: Wikipedia