Gustav Kirchhoff
He graduated from Columbia in 1862, and then studied chemistry with Jean Baptiste André Dumas and Charles Adolphe Wurtz in Paris; with Robert Bunsen, Hermann Kopp, and Gustav Kirchhoff at Heidelberg; with Friedrich Wöhler at Göttingen; and with August Wilhelm von Hofmann in Berlin, and received a D. Phil. at Göttingen in 1866, for his work called "On the Fluorine Compounds of Uranium".