Louis Ferdinand, Prince of Prussia, a member of the Hohenzollern family, was the pretender to the abolished German monarchy, staunch opponent of the Nazi Party in Germany, a businessman, and patron of the arts. Louis Ferdinand was educated in Berlin and deviated from his family's tradition by not pursuing a military career. Instead, he travelled extensively and settled for some time in Detroit, where he befriended Henry Ford and became acquainted with Franklin Delano Roosevelt, among others. He held a great interest in engineering. Recalled from the United States upon his brother's renunciation of the throne, he got involved in the German aviation industry, but was barred by Hitler from taking any active part in German military activities. Louis Ferdinand dissociated himself from the Nazis after. He was not involved in the 20 July Plot against Hitler in 1944 but was interrogated by the Gestapo immediately afterwards and was imprisoned at Dachau. He married the Grand Duchess Kira Kirillovna of Russia in 1938. Kira was the second daughter of Grand Duke Kyril Vladimirovich and Princess Victoria Melita of Saxe-Coburg and Gotha. The couple had four sons and three daughters. His third son, and heir-apparent, Prince Louis Ferdinand died in 1977 during military maneuvers, and thus his one-year-old grandson Georg Friedrich, Prince of Prussia (son of Prince Louis Ferdinand) became the new heir-apparent to the Prussian and German Imperial throne; Georg Friedrich, Prince of Prussia became the pretender to the thrones and Head of the Hohenzollern family upon Louis Ferdinand's death in 1994.