This book about Franz Oppenheimer deals with the construction of the German-Jewish identity of this colorful figure. With the dense biographical presentation, the author succeeds in appreciating both the idiosyncratic theoretical work and the public contribution that Oppenheimer made to both German society and the Jewish community. The presentation focuses on the problem of how Oppenheimer, in the course of his life, came to terms with the tension between his emphasized "non-religious status" on the one hand and his "tribal affiliation" on the other, which he also emphasized.