Starting from 1892, the Prussian Ministry of Culture tried to find a position as a university professor for Belin, so that he could have more freedom in his work and find himself a research fund. This is all the more urgent because of the differences of opinion between Behring and Koch. 1894 During the winter semester of 1995, Riebeling was hired as a professor in the Department of Health of Haller University.
1895, Belin was awarded the position of professor and leader of the Institute of Health Research of Marburg University. 1904 beilin factory (one of the predecessors of deling company) was established here. 19 17 He died of pneumonia in Marburg.