Berek Lajcher
Berek Lajcher was a Jewish physician and social activist from Wyszkw before the Holocaust in Poland, remembered for his leadership in the prisoner uprising at Treblinka extermination camp. More than 800,000 Jews, as well as unknown numbers of Romani people, were murdered at Treblinka in the course of Operation Reinhard in World War160II.
Berek Lajcher was born in Czstochowa under the Russian Partition, into a family of assimilated Polish Jews. He was the fourth of six children of Szmul and Chai Lajcher ne Frydman. His father spoke Yiddish, Polish, and Russian. They lived near the city centre in a house at Stary Rynek 11. Berek occasionally used his Polonized name, Bernard. He attended the multicultural State Henryk Sienkiewicz Secondary for boys in 1907. A year after graduation, in 1915, his father died. Berek moved to the capital and enrolled at the Warsaw University Faculty of Medicine. He supported himself financially by working as a parttime tutor.
Source: Wikipedia