Background
Kostrzak, Jan was born on March 8, 1946 in Józefowo, Kujawy, Poland. Son of Czeslaw and Regina (Czuprynska) Kostrzak.
Kostrzak, Jan was born on March 8, 1946 in Józefowo, Kujawy, Poland. Son of Czeslaw and Regina (Czuprynska) Kostrzak.
Master of Arts in History, University Nicholas Corpernicus, Torun, Poland, 1972. Doctor of Philosophy, Institute History, Polish Academy of Sciences, Warsaw, Poland, 1982.
Assistant professor Institute History, Polish Academy of Sciences, since 1982. Secretary editorial board Science Society Torun, since 1983.
Member Science Society Torun, Polish History Society (secondary secretary district Torun 1984-1987).
Married Felicja Górecka, April 20, 1968. Children: Andrzej-Czeslaw, Anna-Maria.