He finished his habilitation at the University of Vienna in 1879, but because his degree was from a German university he had to wait until 1881 till he became professor at the Vienna Trade Academie.
Han avslutade sin habilitering vid universitetet i Wien år 1879, men eftersom hans examen kom från ett tyskt universitet var han tvungen att vänta tills 1881 innan han blev professor vid Wiena Handelsakademi.