Polish mathematician and cryptologist, designed "Zygalski sheets" during World War II for breaking Enigma-coded messages. Worked with Jerzy Rózycki and Marian Rejewski to break Enigma.
Wikipedia: http://en.wikipedia.org/wiki/Henryk_Zygalski
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