 He obtained his Ph.D. in Law at the Ruhr University Bochum in 1972, after having earned the first and second Staatsexamen in law at the University of Tübingen and Humboldt University Berlin.Arndt worked as scientific assistant during the time of his second "Staatsexamen" studies and referendary at the University of Mainz.After having received his Ph.D. in 1972 and the following habilitation at the Ruhr University Bochum in 1977, Arndt conducted research and teaching at the University of Konstanz until 1983.