Ernst Hanfstaengl
Ernst Franz Sedgwick Hanfstaengl was a German businessman and intimate friend of Adolf Hitler before falling out of favour and defecting. He later worked for Franklin D. Roosevelt and was once engaged to the author Djuna Barnes.
Ernst Hanfstaengl, nicknamed Putzi, was born in Munich, Bavaria, Germany, the son of a German art publisher, Edgar Hanfstaengl, and an American mother. He spent most of his early years in Germany and later moved to the United States. His mother was Katharine Wilhelmina Heine, daughter of William Heine, a cousin of American Civil War Union Army general John Sedgwick. His godfather was Duke Ernst II of SaxeCoburg and Gotha. He had an elder sister, Erna, two elder brothers Edgar and Egon, and a younger brother Erwine.
Source: Wikipedia