The political scientist Andrzej Klimowicz was a member of Stronnictwo Demokratyczne (Democratic Party). He had many Jewish friends and maintained close contact to the Zionist youth movement Gordonia. When the German Wehrmacht invaded Poland in September 1939, Klimowicz fought on the side of the Polish army. After Warsaw’s occupation his Jewish acquaintances were subject to persecution; Klimowicz supported them where he could. In 1942 he joined the underground organization Żegota (Council to Aid Jews). As a member, he provided Jews escaped from ghettos with forged documents, money, and accommodation. He hid some of them in his vulcanization workshop in the center of Warsaw. The workshop was also used as a secret Żegota meeting place. Members of Żydowska Organizacja Bojowa (Jewish Combat Organization), who were preparing an armed uprising in the Warsaw ghetto, also met there.
Klimowicz was honored as Righteous Among the Nations by the Israeli Holocaust memorial center Yad Vashem in 1981.