Warsaw Ghetto inmates

Kalonimus Kalman Szapiro (English: Kalonymus Kalman Shapira or Klonimus Kalmish Szapiro) (20 May 1889–3 November 1943), was the Grand Rabbi of Piaseczno, Poland, who authored a number of works and was murdered by the Nazis during the Holocaust.

Ludwik Hirszfeld (Polish pronunciation: [ˈlud.vik xirʂfeld]; 5 August 1884 – 7 March 1954) was a Polish microbiologist and serologist. He is considered a co-discoverer of the inheritance of ABO blood types.