Kosiński was born Josef Lewinkopf to Jewish parents in Łódź, Poland. As a child during World War II, he lived in central Poland under a false identity his father gave him to use, Jerzy Kosiński. A Roman Catholic priest issued him a forged baptismal certificate. The Kosiński family survived the Holocaust thanks to local villagers, who offered assistance to Jewish Poles often at great personal risk (the penalty for assisting Jews in Nazi-occupied Poland was death). Kosiński's father received help not only from Polish town leaders and churchmen, but also from individuals such as Marianna Pasiowa, a member of the Polish underground network helping Jews to evade capture. The family lived openly in Dąbrowa Rzeczycka near Stalowa Wola, and attende