In 1965, Jan Karski married Polish-Jewish dancer-choreographer Pola Nireńska, the love of his life. Most of her Jewish family was murdered in death camps during the war. Only Nireńska and her parents managed to escape. She left Poland early in the interwar period, in order to become a dancer. Her parents moved to Palestine in the 30's, sensing thay Jews in Europe may soon become endanegered.