Jan Karski was a Polish resistance fighter during World War II, known for his courageous efforts to inform the world about the atrocities committed by the Nazis against the Jewish population in Europe. He served as a courier for the Polish government-in-exile, risking his life to deliver crucial information about the situation in occupied Poland. Karski's most notable mission involved smuggling himself into the Warsaw Ghetto and a Nazi concentration camp to witness the conditions firsthand. After the war, he became a professor at Georgetown University and continued to advocate for human rights, sharing his experiences and promoting awareness of the Holocaust.