The "Oneg Shabbat" Archive, also known as the Ringelblum Archive, is one of the most impressive and unique projects initiated by the Jews during the Holocaust. This underground archive was established and run by historian and community figure Dr. Emanuel Ringelblum, with the express purpose of documenting the reality of life under Nazi occupation.
Prof. Israel Gutman was born in Warsaw in 1923. He was wounded in the Warsaw Ghetto Uprising, sent to Majdanek, then to Auschwitz and then on a death march to Mauthausen. Prof. Gutman is an internationally renowned Holocaust scholar and was the Academic Advisor to Yad Vashem.
Taken from "Let the World Read and Know: Witness to the Holocaust, The Oneg Shabbat Archives" http://www1.yadvashem.org/yv/en/exhibitions/ringelbum/index.asp