Jan Karski , true name Jan Kozielewski (June 24th, 1914 Łódź, July 13rd, 2000 Washington) resistant Polish during the Second world war - mail of the Armia Krajowa (Armed with the Interior), diplomat of education.

In January 1939, it was employed with the Polish ministry of the Foreign affairs. During the program of September 1939 makes captive by the Soviet , then given to the hands of the German . In November 1939 succeeded in escaping from a transport of prisoners, arrives at Warsaw and joined resistance. As from January 1940, it takes share with the missions of connection with the Polish government in exile in France. Captive fact by the Gestapo in Slovakia in June 1940, escaped by Resistance from the hospital to Nowy Sącz. It took part then in the activities of the Office of the propaganda and the information of the Armia Krajowa (AK - the largest organization armed with Polish resistance under the occupation Nazi).

In summer 1942 envoy on mission clandestine with London to give an account of the situation to Poland to the Prime Minister in exile, the General Władysław Sikorski and with the representatives of the other Polish political parties in exile. In Poland, it is introduced twice into the Ghetto of Warsaw, collection also information on the concentration camps and German extermination. In autumn 1942, it leaves on mission in Great Britain and with the E. - U. to give an account of the extermination of the Jews by the Nazis on the territory of occupied Poland. The Rapport Karski is sent by the Sikorski general to the governments British and American with the request for assistance to the Juifs Polish. In 1943, Karski could meet the British Minister for the foreign affairs Anthony Eden and chair it of the United States Roosevelt, but also of the leaders of the Jewish community in the two countries. The majority of the people had a reaction comparable with that of Felix Frankfurter, a judge of Court Supreme of the United States, itself Jewish, which after having listened to the history of Karski said to him: " Young man, I do not say to you that you are a liar, but I do not believe you pas" ( I amndt not saying that you are has liar. Goal I C not believe you ). It will present his report/ratio to the policies, bishop S, with the press, the artists… but nobody was really interested in his revelations.

He wrote in 1944 My Testimony in front of the world: History of a secret State devoted at the Polish clandestine State.

After the war it remains in the United States where it worked forty years with the Georgetown university with Washington.