Bruno Emil Tesch (14th August 1890 - 16th May 1946) was a German chemist, entrepreneur and inventor of the poison gas Zyklon B. During The Holocaust, Tesch assisted Rudolf Höß, commandant of Auschwitz Birkenau, and his lieutenant Karl Fritzsch by supplying them with Zyklon B to exterminate Jews. After World War II, Tesch and Karl Weinbacher were convicted of War crimes and assisting Genocide and executed by hanging.