On 1 January 2007, Prof. Dr. rer. nat. Martin Winterkorn became Chairman of the Board of Management of Volkswagen AG. On the same date, he became Chairman of the Supervisory Board of AUDI AG. With effect from February 2007, the Supervisory Board of Volkswagen AG appointed Martin Winterkorn as a Member of Board of Management of Volkswagen AG responsible for the area 'Group Research and Development'. At the same time, he took over the Chairmanship of the Board of Management of the Volkswagen brand in addition to his other tasks. Winterkorn joined the Board of Management of Porsche Automobil Holding SE, Stuttgart, on 25 November 2009, assuming responsibility as Chairman of the Board of Management of this company in addition to his present functions.