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Marc Perez is the Director of the Department of Transport Planning, Operation & Rolling Stock at TransportTechnologie-Consult Karlsruhe GmbH (TTK), a position held since November 1996, where also serves as the Responsable activité France. Previously, Marc worked as a Research Assistant at the Laboratoire d'Economie des Transports in Lyon from September 1992 to April 1996. Marc holds a PhD in Economics from Université Lumière Lyon 2, completed in 1996, and an Ing. in Physics from INSA Lyon, obtained in 1991.