Born in Lwow, Poland, in 1878, I studied and taught both mathematics and philosophy at the University of Lwow.
Between the World Wars, I was Minister of Education, a Professor, a Dean, and a Rector of the University.
My wife and I suffered greatly during WWII...our house was bombed and burned, I lost my entire library and all of my manuscripts....we eventually fled Poland and were exiled in Belgium.
During WWII, I gave lectures at the underground university in Warsaw and helped govern the the city (though it was occupied by Germany).
Some people have ranked me as one of the most brilliant logicians of the early 20th century, primarily for my creation of three-valued logic: True, False, and Don't Know.
The two remnants of my work that exist today are the truth table and Reverse Polish Notation (RPN) on some calculators.
Jan Lukasiewicz (1878-1956)