This biography chronicles the life of professor Emil J. Gumbel (1891-1966) one of Weimar Germany’s foremost left-wing intellectuals. A pacifist, socialist, and human rights activist, Gumbel is best remembered for his exposés on political violence and politicized justice in Nazi Germany. A “one-man party,” at the center of the most acrimonious political battle in Weimar academia, Gumbel stood alone among his peers courageously speaking out against the Nazis.