Board of Directors & Specialized Comittees

Mr. 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).

Ms. Carole Foissaud spent a large part of her career in the Areva Group (now Orano and Framatome), where she held several executive positions, including Chairman and CEO of Areva TechnicAtome (from 2014 to 2017), Director of Safety, Security and Operations Support (from 2012 to 2014), Director of the Sanitary BU and  Chairman and CEO of STMI and its subsidiairies. In 2017, Mrs. Foissaud joined the Bouygues Group as Managing Director, Energy & Industry Division, of Bouygues Energies and Service (2017-2021), then General Manager of Specialties at EQUANS group (2021-2023).. Mrs. Carolle Foissaud is a graduate of the Ecole Polytechnique and the Ecole Supérieure des Télécommunications.

Mr. Antoine Rostand currently serves as Chairman & CEO, Founder of KAYRROS, a global energy and environmental geoanalytics company, helping governments, companies and investment markets to make better decisions. Previously, Mr. Rostand spent a large part of its career within the Schlumberger group, where he held various management positions, including Global Managing director of SBC, Schlumberger Business Consulting that he founded in 2004. Prior to SBC, he was Director of the Consulting and System Integration of Schlumberger Sema, and President of Electronic Data System (EDS) France. He has worked with many of the world’s largest oil companies, advising them in various strategic areas. Mr. Antoine Rostand is a graduate of the Ecole Polytechnique. He also holds a Master of Business Administration of INSEAD, and is a former French Navy officer.

Mr. 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.

Mr. Pascal MACIOCE is currently a senior partner of the capital development company NextStage AM, which he joined in 2018, in charge of the group’s development in France and abroad. Previously, he began his career in 1979 with Arthur Andersen where he held various management positions. He joined Ernst & Young in 2002, where he extended his responsibilities from France to Europe and then to the EMEA region, of which he became Managing Director in 2014, in charge of the different service lines (audit, legal and tax consulting and transactions). Mr. Pascal MACIOCE is a graduate of ESCP.

Ms. 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).

Ms. Frédérique Kalb, of French and German nationality, has over 20 years of international experience in strategic management of R&D, operations, and business in a wide range of industries (including Schlumberger Group, Aptiv, Nexans). Since 2020, Ms. Kalb has joined the Alstom group as the General Manager of the Rolling Stock site in Saint-Ouen, where she leads the implementation of major international tenders and projects in the railway sector. Ms. Kalb holds a degree from ESPCI Paris, as well as a Master’s degree in Solid-State Physics, a Ph.D. in Physics from the Collège de France, and an Executive Finance diploma from IMD Lausanne.

Mr. Gillet has over 30 years of experience in the maritime transport industry. He began his career in 1982 in offshore operations at ETPM and joined Bureau Veritas, the French classification society, in 1983 where he held various management positions. He joined TotalEnergies in 2003 as Deputy Director for Maritime Transport and was later appointed Director of Maritime Transport and President of the chartering company CSSA in 2008, a position he held until 2022. Mr. Gillet is a graduate engineer from the Ecole Nationale Supérieure de Techniques Avancées (1980) and holds an Executive MBA from HEC.

Ms. Domitille Doat-Le Bigot has held several executive positions in the digital field at companies such as Danone (from 2016 to 2022), Fred & Farid (from 2014 to 2016), Cisco (from 2012 to 2014), Ubisoft (1998 to 2012), and Accenture (from 1996 to 1996). Ms. Doat has excellent knowledge of Asia, particularly China (where she was expatriated for 6 years), India, Southeast Asia, and Japan. She is currently the Chief Digital Data and Tech Officer at EURAZEO. Ms. Doat is a graduate of ESSEC.