Hermann Emil Fischer
After preschool education Oppenheim attended the "Köllnische Gymnasium" in Berlin (1887–1896). Right after his Abitur he studied at the Berlin Institute of Technology, at the Bergakademie Berlin, and at the Humboldt University of Berlin Chemistry, Physics, Botany, Bacteriology, Mineralogy, and Philosophy. During this time Blasius, Dilthey, Finkener, Hermann Emil Fischer, Gabriel, Günther, Jacobus Henricus van 't Hoff, Jahn, Klein, Adolf Lasson, Ernst Pringsheim Sr., Rosenheim, Warburg, Wichelhaus und Witt were among his docents.