(born 1 April 1949 in Paris) is the Chairman and CEO of GDF Suez, as well as the Chairman of the Board of Suez Environnement.
He graduated from Sciences Po Toulouse, the Ecole polytechnique, École nationale de l'aviation civile and the École nationale d'administration.
After his graduation from ENA, he joined the Treasury. Between September 1982 and July 1984 he was the technical advisor in charge of industrial affairs under the Minister of Economics and Finance (during the time of Jacques Delors)
In 1984, he started working as a special advisor for Suez, known today just as Suez. He has been its Chairman and CEO since 2001.He was named Deputy Delegate General for Industrial Affairs in June 1986. In July 1987, he was General Director of the European Court of Human Rights, an affiliate of the Compagnie financière de Suez. In January 1991 he started as the Deputy Director General of the company, but a month later he became the Managing Director and Chairman of the Management Committee of the Société General de Belgique, to ensure its refocusing and development.
He was appointed as a member of the Hong Kong Chief Executive's Council of International Advisers in the years of 1998-2005. He is the President of Ill|fr|Paris Europlace. He is also the President of the Fondation Agir Contre l'Exclusion (FACE).
In 1995 he took a position as the head of Suez and since then he has worked for Suez while focusing on three businesses: energy, water, and waste He was also the instigator of the reconciliation between Suez and the Lyonnaise des Eaux. The Suez-Lyonnaise des Eaux was started in 1997, at which time Mestrallet became the chairman of its executive board while Jérôme Monod, chairman of Lyonnaise, became the Chairman of the Supervisory Board.
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