Dr. Stumpf received his economics degree at the University of Saarland, Saarbrücken, and his doctoral degree at the Technical University of Berlin.

He worked as an Assistant Professor at the Technical University of Berlin (19978 – 83) and as a Senior Economist for the Monopolkommission, an advisory body for competition policy to the German Ministry of Economics (1983-89).

Since 1990, he is with WIK Wissenschaftliches Institut für Kommunikationsdienste GmbH, where he has lead several research departments. Since 1995, he is Deputy Director of the Institute, since 2001 one of its two Directors.

Dr. Stumpf has a 20-year experience in advising Regulatory and Competition Authorities both in Germany and other countries as well as the European Commission (DG Information Society and DG Competition) and has been the author of numerous studies on regulatory and competition policy issues in the telecommunications and postal sector.

He has provided expert advice in various ministerial and parliamentary hearings in Germany.