“20 good years in Osnabrück": This was the title of Prof. Dr. Joachim Hertzberg's farewell lecture at Osnabrück University on Tuesday, August 27. Twenty years in which the renowned computer scientist helped shape his subject and therefore the entire university, as University President Prof. Dr. Susanne Menzel-Riedl emphasized in her welcoming address in the Bohnenkamp House in the university's Botanical Gardens.