Czesław Ryll-Nardzewski

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Czesław Ryll-Nardzewski (b. October 7, 1926 in Wilno, Poland (now Vilnius, Lithuania) is a Polish mathematician.

He was a student of Hugo Steinhaus. At the age of 26 he became professor at the Warsaw University and in 1959 at the Wrocław University of Technology. His main research areas are measure theory, functional analysis, foundations of mathematics and probability theory. At least two theorems bear his name: the Ryll-Nardzewski fixed point theorem and the Kuratowski–Ryll-Nardzewski selection theorem.

He is a member of the Polish Academy of Sciences since 1967.