 Throughout the years, Gross taught and engaged in constructive debate while professor at Chernivtsi University (1897 to 1902), Prague University (1902 to 1905), and the University of Graz (1905 to 1915).Later in 1898, he established the Institute of Criminology of Graz.On August 1898, he began to teach criminal law in which he presented the field of criminalities.