abstract:Irena Sendler (née Krzyżanowska, also referred to as Irena Sendlerowa in Poland, Nom de guerre Jolanta; 15 February 1910 – 12 May 2008) was a Polish Roman Catholic nurse/social worker who served in the Polish Underground during World War II, and as head of children's section of Żegota,Mordecai Paldiel, The Path of the Righteous: Gentile Rescuers of Jews During the Holocaust, Ktav Publishing House (January 1993), ISBN 08812537660Yad Vashem Shoa Resource Center, "Activites Żegota" PDF file, Żegota, page 4/34 of the Report. an underground resistance organization in German-occupied Warsaw.