The GTT (Gaztransport & Technigaz) Board of Directors is composed of nine members, five of whom are independant (55%) and four of whom are women (44%) :

Board of Directors

Chairman of the board & CEO

Philippe Berterottière joined GTT in 2009. He has more than 35 years of experience in advanced technology sectors. Previously, he served in various senior positions with aerospace companies. At Airbus, he was a contract negotiator, before being appointed head of business development. He was sales director at Matra’s defence division and held various sales and marketing responsibilities at Arianespace, before being named Sales and Marketing Director and an Executive Committee member. He is a graduate of the prestigious HEC business school (Hautes Etudes Commerciales) and of the IEP (Institut d’Etudes Politiques).



Isabelle Boccon-Gibod, a graduate of École Centrale and Columbia University in New York (United States), began her career in 1991 with the International Paper Group. She joined the Packaging Division, where she managed various operations in the United States of America until 1996, then in the United Kingdom from 1997 to 2001, before taking charge of strategic development for Europe for the entire group until 2004. She joined Sequana in 2006 where she was appointed Deputy Chief Executive Officer and Executive Director of the Arjowiggins Group in 2009. She left Sequana in 2013 and was a director from 2016 to 2019.



Bruno Chabas joined SBM Offshore as Chief Operating Officer and Member of the Management Board in May 2011 and became CEO in January 2012. Prior to joining, Bruno Chabas worked for 18 years with Acergy S.A. (now Subsea 7 SA). From November 2002 until January 2011, he served as the Chief Operating Officer of Acergy S.A., responsible for all the day-to-day commercial and operational activity worldwide. From June 1999 through October 2002, he served as Chief Financial Officer. Between 1992 and 2002, Bruno Chabas held various management positions within preceding companies in the United Kingdom, France and the United States. He has been an Independent Non-Executive Director of FORACO International S.A. since August 2007. Bruno Chabas holds an MBA from Babson College, Massachusetts.


Florence Fouquet is a Civil Engineer of the Mines Corps and began her career in 1999 at the General Office of Energy and Raw Materials, then attached to the Ministry of Economy, Finance and Industry. She was appointed head of the office within the gas subdivision and then within the nuclear industry subdivision, which she then took charge of in 2004. At ENGIE (formerly GDF SUEZ) since 2006, Florence Fouquet has been Director of the European Affairs Department in the Strategy Division. In 2010, she joined the energy management operational activities, where she is in charge of the optimization of the Group's electricity and gas assets. In 2015, she joined ENGIE's French sales department as Director of the professional clients market. In 2018, she was appointed Director of the public market, in charge of sales on the individual customer market. Since September 2021, Florence Fouquet has also been in charge of commercial activities on the residential market in Italy for ENGIE. Florence Fouquet is also President of the BtC Commission of the Union française de l'électricité (UFE) and a member of its Board of Directors. Finally, she is a director of ENGIE IT since April 2020.



Christian Germa is an engineering graduate of the École Polytechnique (1992) and the École Nationale des Ponts et Chaussées (1995). He began his career at the French Ministry for the Economy and Finance, within the Treasury Department, where he worked for several years on the CIRI, the Interministerial Committee on Industrial Restructuring, where he served as Deputy Secretary-General. In 2000 he joined the FD5 investment company as head of investment. From 2002 to 2014, Christian Germa gained experience within the Vinci Group, where he successively held positions as director of construction projects, then director of public-private partnerships for Vinci Construction France. During this time, Christian Germa held several directorships as an independent director, from 2010 to 2012, on the Board of Directors of Vodafone SA and, since 2004, on the Supervisory Board of Faiveley Transport, where he is also Chairman of the Audit Committee.



Pierre Guiollot is a graduate of the School of Political Science, Paris, public service section. His career started as an external audit manager at KPMG between 1992 and 1997. In 1997, he joined the Suez group, where he occupied various positions: deputy manager of the consolidation of the Suez group between 1997 and 2004, manager of the accounts department for Suez and Tractebel between 2004 and 2006, Vice-President accounting and consolidation for GDF Suez between 2006 and 2013, Financial Director of GDF Suez International between 2013 and 2015, then Deputy Financial Director for the ENGIE Group since 2015.



Andrew Jamieson has vast experience of the energy industry in general and LNG in particular. He held various positions with Shell Group in Europe, Australia and Africa before being appointed, in 2005, Executive Vice-President “Gas & Projects” and member of “Gaz & Power” Executive Committee of Shell, functions he retained until he retired in 2009. Andrew Jamieson serves as Director in different companies specialized in the energy sector. He is an Officer of the Order of the British Empire (OBE) and a Fellow of the Royal Academy of Engineering. He chaired the Royal Institute of Chemical Engineers between 2015 and 2016. Andrew Jamieson is a Chartered Engineer and holds a Ph.D. degree from Glasgow University.


  • BENOIT MIGNARD (Observer)

Benoît Mignard, civil engineer graduate of the Ecole des Mines de Paris. After having held various positions at the Research Development division of EDF, Benoît Mignard joined Gaz de France in 1992 and took the head of the Trading Office and of the Budget. In 1999, he is in charge of the negotiation of gas supply contracts, and then of economic studies. In 2002, he undertakes the development of “structured transactions gas and LNG,” activities accompanying the opening of the energy markets in Europe. In 2006, he joined the Finance department as head of Investments Acquisitions, a position he held at GDF SUEZ after the merger of 2008. In 2012, he became deputy director GDF SUEZ E&P INTERNATIONAL and in October 2015 deputy director, in charge of Finance and Strategy for the Global Gas Branch and LNG of ENGIE. Benoît Mignard served as member of GTT’s board from 2012 to 2014, then from 2016 to 2017.



Sandra Roche is, since June 2019, the Chief Executive Officer of Elengy. She was formely Chief Business Development Officer for North, South and Eastern Europe Business Unit, also in charge of developing and managing activities in new regions and countries (Russia, Ukraine and Nordic countries). Sandra Roche joined GDF SUEZ Group (Suez Environnement) in 2006 as Director of Operations of Degrémont Industry (turnkey industrial water treatment plants). She worked as Deputy Vice President Projects for GDF SUEZ Exploration & Production. Later appointed Senior Vice President for New Gas, she worked during two years defining and promoting the Group’s medium and long-term Green Gas strategies (biogas, hydrogen, etc.).Before joining the Group, she held various managerial positions in Oil and Gas projects for multinational Engineering, Procurement and Construction (EPC) Companies (Technip, Sofregaz, Saipem), in several countries (West Africa, North Sea, Gulf of Mexico, China) and different sectors, particularly in upstream onshore/offshore activities and regasification of liquefied natural gas (LNG*). She is a graduate of the Ecole Centrale de Nantes with a specialization in offshore design and naval architecture.



Catherine Ronge is a graduate of the Ecole Normale Supérieure and holds a PhD in quantum physics. She is also a graduate of a short Executive Program of the European Institute of Business Administration (INSEAD). She started her career in 1984 as a research engineer at CEA, then held various positions within the AIR LIQUIDE group (1988-1999) in marketing, sales, strategy / M&A and R&D.
Within the SUEZ group (1999-2006), she was Deputy CEO of Degrémont in charge of worldwide industrial activities and North America subsidiary, then Chairman and CEO of ONDEO INDUSTRIAL SOLUTIONS, a company gathering all the engineering, construction, equipment manufacturing and industrial water operation activities of the SUEZ group worldwide.
She was then the founding President of the strategy, innovation and sustainable development consulting firm WEAVE AIR (2006-2020).
Catherine Ronge is currently Chairman and CEO of LE GARREC & CIE, a medium-sized family business with diversified activities (since 2020).
She is also a director of COLAS (since 2014), PAPREC GROUP (since 2014) and ERAMET (since 2016).


Specialized Committees

The specialized committees are tasked with preparing resolutions for the Board of Directors, making recommendations to the Board and providing advice and recommendations on issues within their specific scope of competence. 


None of this committee members have management roles within the company, and all of whom have particular expertise in finance and accounting. 

Chairman of the committee: Christian Germa
Composition: Christian Germa, Sandra Roche-Vu Quang and Catherine Ronge


This committee is tasked with assisting the Board of Directors in selecting its own members, the members of its committees, and the company's Chief Executive Officer. It also makes recommendations to the Board of Directors on issues of compensation.

Chairman of the committeeBruno Chabas
Composition: Isabelle Boccond-Gibod, Bruno Chabas, Pierre Guiollot and Andrew Jamieson


This committee assesses the Group's internal or external development opportunities in new business areas, in particular in the digital, LNG as fuel, gas chain and hydrogen activities.

Chairman of the committee: Isabelle Boccond-Gibod
Composition: Christian Germa, Isabelle Boccond-Gibod, Andrew Jamieson, Florence Fouquet and Catherine Ronge


GTT headquarters in Saint-Rémy-Lès-Chevreuse