Jakob (Jack) Reimer (November 6, 1918 – August 3, 2005) was a Trawniki camp guard who later emigrated to the United States and became a salesman and restaurant manager.
When Germany invaded the Soviet Union on June 22, 1941, Reimer entered combat and was captured by German forces on July 6.
While serving as a camp guard, Reimer participated in the liquidation of Jewish ghettos in Poland, in addition to administrative and office duties.
During his time in the United States, he worked as a Wise potato chip salesman and a restaurant manager, and lived in Brooklyn, New York.
Not until the fall of the Soviet Union and the end of Communism in the Eastern Bloc did investigators make substantial progress, as formerly restricted archives were opened up to Western historians.