Prof. Dr Dr Udo Di Fabio began his professional career in 1970 as a local government official in Dinslaken, Germany. While working there he completed his his-school graduation via second-chance education and then continued to study law at the Ruhr University in Bochum and social sciences at the University of Duisburg (now the University of Duisburg-Essen). After completing the two state law exams in 1982 and 1985, Prof. Dr. Dr. Udo Di Fabio initially worked as a Judge at the Duisburg Social Court before moving to the Institute for Public Law at the University of Bonn in 1986 as a Research Assistant. There he received his doctorate a year later. A doctorate in social sciences followed in 1990. Upon completion of his post-doctoral qualification in 1993, he was appointed University Professor for Public Law at the Westphalian Wilhelms University in Münster the same year. A few months later accepted a chair at the University of Trier. From 1997 to 2003 Prof. Dr. Dr. Udo Di Fabio taught public law and constitutional history at the Ludwigs-Maximilians-University in Munich. Since 2003 he has been Professor of Public Law at the Rheinische Friedrich-Wilhelms-Universität in Bonn. In 1999 Prof. Dr. Dr. Udo Di Fabio was appointed Judge of the Federal Constitutional Court in the Second Senate. His department was responsible in particular for European law, international law, and parliamentary law. The twelve-year term ended on December 19, 2011. Today he teaches as a University Professor in Bonn. Since 2016 he has been Director of the Research College for Normative Foundations of Society at the University of Bonn.