Jan Grabowski, "The Last Days of Emanuel Ringelblum: Hunting Down the Jews in Hiding, Warsaw, 1943-44" Jan Grabowski is Professor of History at the University of Ottawa. An expert on the history of the extermination of Polish Jews and Jewish-Polish relations during the Holocaust, he is the author of several monographs, including Hunt for the Jews: Betrayal and Murder in German-Occupied Poland (2013), which won the Yad Vashem International Book Prize.