In the early decades of the twentieth century, almost everyone in modern theater, literature, or film knew of Otto Kahn (1867-1934), and those who read the financial press or followed the news from Wall Street could scarcely have missed his name. A partner at one of America's premier private banks, he played a leading role in reorganizing the U.S. railroad system and supporting the Allied war effort in World War I. The German-Jewish Kahn was also...