Click Here to Read: Historian Who Shed Light on WWII Massacres Goes From Honoree to ‘Pole Hater’ Prof. Jan Tomasz Gross was once revered for his work detailing the inconvenient truth that some Poles were responsible for massacring Jews. Today’s Poland, Gross told Haaretz, must come to terms with the past through intensive soul-searching by Ofer Aderet on the Ha’artz website on March 1, 2016.