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Jean-Marie Messier (born December 13, 1956) is a French businessman who was Chairman and Chief Executive of the multinational media conglomerate Vivendi SA (formerly Vivendi Universal) until 2002.
After studying at the École Polytechnique from 1976 to 1980, and then at the École nationale d'administration between 1980 and 1982, Messier held several posts at the Minister of the Economy, Finance and Industry (France) during the 1980s, before moving to investment bank Lazard Freres in 1989. After taking up the chairmanship of the utility company Compagnie Générale des Eaux]] in 1994, he oversaw its diversification into the media sector and its 2000 merger with Canal+ and Seagram (owners of Universal Studios) to form Vivendi Universal.