From 1967 to 1971, after taking the first level and second level state examinations on law, he got his traineeship at the University of Bonn.

• 1967 和1971分别通过一级和二级国家司法考试，在波恩大学获得法律实习津贴，并于1971凭借论文“联邦政府在促进学术研究中的责任”拿到博士学位。