Polish mathematician and cryptologist whose work with Marian Rejewski and Henryk Zygalski broke the German Enigma machine's ciphers.
Wikipedia: https://en.wikipedia.org/wiki/Jerzy_R%C3%B3%C5%BCycki
IEEE Article "IEEE Milestone Honors Poland’s World War II Code Breakers" http://theinstitute.ieee.org/technology-focus/technology-history/ieee-milestone-honors-polands-world-war-ii-code-breakers