Berek Lajcher

Berek Lajcher (October 24, 1893 – August 2, 1943) was a Jewish physician and social activist from Wyszków 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 War II. Lajcher was a graduate of the Warsaw University Faculty of Medicine in 1924, and a retired officer of the Polish Army from the Polish–Soviet War of Independence.