Christoph Walther graduated from the University of Ulm with a Diploma in Business Mathematics. With respect to his scientific work at the Institute for Economic Policy and Research, he received a PhD in Economics from the University of Karlsruhe (Prof. Rothengatter). After six years of work with Prognos AG, Basle (Switzerland), he joined PTV (Karlsruhe, Germany) as Transport Economist in 1998 and today, as “Head of Global Research” and authorised officer, he is leading the division “Transport Policy & Research”. Christoph Walther has over 25 years of experience in the fields of transport planning, transport economics and transport policy. His activities as a scientific advisor is documented in more than seventy national and international projects. His work focusses on the development of macroeconomic evaluation procedures for the improvement of transport systems, the optimization of use of transport infrastructure (maintenance planning, civil security of transport infrastructure, transport management systems) as well as on integrated transport and logistics planning. In 2011, Christoph Walther has been appointed honorary professor for “Macro-economic assessment of network infrastructures” after several years of teaching at the Faculty of Civil Engineering at the Bauhaus University Weimar.