Jan Karski (24 April 1914 -- 13 July 2000) was a Polish World War II resistance movement fighter and later professor at Georgetown University. In 1942 and 1943 Karski reported to the Polish government in exile and the Western Allies on the situation in German-occupied Poland, especially the destruction of the Warsaw Ghetto, and the secretive German-Nazi extermination camps. In November 1939, on a train to a POW camp in General Government (a part of Poland which had not been fully incorporated by Nazi Germany into The Third Reich), Karski managed to escape, and found his way to Warsaw. There he joined the ZWZ -- the first resistance movement in occupied Europe and a predecessor of the Home Army (AK). About that time he adopted a nom de guerre of Jan Karski, which later became his legal name. Other noms de guerre used by him during World War II included Piasecki, Kwaśniewski, Znamierowski, Kruszewski, Kucharski, and Witold. In January 1940 Karski began to organize courier missions with dispatches from the Polish underground to the Polish Government in Exile, then based in Paris. As a courier, Karski made several secret trips between France, Britain and Poland. During one such mission in July 1940 he was arrested by the Gestapo in the Tatra mountains in Slovakia. Severely tortured, he was finally transported to a hospital in Nowy Sącz, from where he was smuggled out. After a short period of rehabilitation, he returned to active service in the Information and Propaganda ...