Mark von Stackelberg
Google: "Nicolai Mark Otto August von Stackelberg"
Besides Wizinger the following assistants were habilitated for chemistry and physical chemistry, respectively: Eduard Hertel (1925), Otto Schmitz-Du Mont (1927), Hermann Ludwig Orthner (1929), Mark Freiherr von Stackelberg (1930), and Hermann-Josef Antweiler (1939). M. von Stackelberg became professor in 1936, and H. J. Antweiler in 1946. Both stayed in Bonn upon their retirement.
Wizinger had to leave Bonn under the pressure of the Nazi regime; he went to Switzerland and founded the Institut für Farbenchemie in Basel, but after the world war he was again a regular guest lecturer in Bonn covering the fields of color theory and dyes.