After the war, the first freely elected senate chose von Melle as mayor. He and Rudolf Ross advocated for education reform in Hamburg, and were able to pass a law establishing both the university and an adult high school. On 28 March 1919, the University of Hamburg opened its gates, increasing the number of full professorships in Hamburg from 19 to 39. Both the Colonial Institute and the General Lecture System were absorbed into the university. The university's first Schools, or Faculties, were Law and Political Science, Medicine, Philosophy and Natural Sciences.