 The year 1921 marks a big change in Scholz’s focus of philosophical research. He himself tells the story that he discovered his love for mathematical logic by accidentally coming across Whitehead’s and Russell’s Principia Mathematica (Whitehead and Russell 1910–13, cf. Peckhaus 2005) in the library of the University of Kiel. This work convinced Scholz of the significance of mathematics, although he had no deeper knowledge of this subject at that time. As a full professor of philosophy he decided to begin formal university studies of mathematics and theoretical physics. After having moved to Münster, Scholz focused his research on mathematical logic and foundations.