Médiamétrie Executive Committee
Yannick Carriou, CEO
A graduate of Ecole Polytechnique and ENSAE, Yannick Carriou was Managing Director of TNS-Sofres France (2006-2010), Ipsos France (2010-2012) and CEO of Ipsos Connect (2013-2017). Between 2017 and the end of 2019, Yannick Carriou was Chairman and CEO of Teknowlogy Group. He has been Chairman and CEO of Médiamétrie since April 2020. He is also President of the AMC (Audience Measurement Coalition), a professional association in the field of audience measurement that brings together JICs (Joint Industry Committees), MOCs (Media Owner Committees), and market research companies.
Julien Rosanvallon, Deputy CEO - Marketing et Customer Experience
A graduate of Magistère in Management Science from Dauphine University and a Master's degree from IEP Paris, Julien Rosanvallon started his career at Orange Advertising as Head of Research. He joined Médiamétrie in 2003 as Director of the Médiamétrie//NetRatings subsidiary. In 2011, he became head of Médiamétrie's TV department and in 2016, he also became head of the Internet department. At the end of 2018, Julien Rosanvallon was appointed Executive Director of TV and Internet at Médiamétrie. Since 2020, he has been Deputy CEO in charge of Audience Measurement. He is the author of three books on media, measurement, and digital technology, including “La Mesure des Médias” (Media Measurement), published in 2025 by Editions Economica.
Laurent Battais, Deputy CEO - Development
In charge of Médiamétrie's Development and International Activities, Laurent Battais is a board's member of the subsidiaries Glance Consultancy, Médiamétrie NetRatings, and MarketingScan, a subsidiary of GfK and Médiamétrie, which he managed from April 1996 to December 2007 before joining Médiamétrie.
Prior to that, Laurent Battais started his career at Secodip, working on consumer and distributor panels. He holds a DESS (diploma of specialised graduate studies) in economics and agri-food from the University of Nantes.
Bernard Chesnet, Deputy CEO – Operations
An engineer from the Ecole Supérieure d'Electricité (SUPELEC) with a Master's degree in Physics, Bernard Chesnet spent most of his early career at TDF, where he held successive positions in R&D, Key Account Sales, and Marketing for the TV Division, before becoming Deputy Regional Director for the Southwest region. Bernard Chesnet joined Médiamétrie in 2008 as Director of the TV Department. In 2011, he was appointed Executive Director in charge of Technology and Information Systems. Since 2018, he has been Deputy CEO in charge of Operations.
Gaël de Cagny, Executive Director - Human Resources
With a degree in Labor Law (Panthéon Sorbonne Paris 1 University), Gaël de Cagny has built up his HR expertise across three strategic sectors: telecommunications (TDF), real estate (Nexity), and audience measurement : he joined Médiamétrie in 2021 as Director of Human Resources, overseeing the development of HR practices and supporting organizational transformation to enhance collective performance.
Estelle Duval, Executive Director - Strategy and Transformation
A graduate of Neoma Business School (Master Grande Ecole), Estelle Duval worked for several years within Nielsen as a Marketing Consultant. Estelle joined Médiamétrie in 2006 as Marketing and Development Director of the Médiamétrie//NetRatings subsidiary before becoming its head in 2011 and leading Médiamétrie's Internet Department until 2016. In 2017, she was appointed head of the Data Department. Since 2020, Estelle Duval has been Director of Strategy, Transformation, and CSR at Médiamétrie.
Marie Liutkus, Executive Director – Communication
A graduate of Sciences Po, Marie Liutkus has been Director of Communications at Arcom, the French regulatory authority for audiovisual and digital communications, since 2020. She previously worked at Radio France, where she held the positions of Deputy Director of Group Communications and then Director of Communications at franceinfo. Since the end of 2024, Marie Liutkus is Director of Communications at Médiamétrie.
Yann Olivier Rioux, Executive Director - Administration and Finance
A graduate of Sciences Po, Yann-Olivier Rioux joined Médiamétrie as Chief Financial Officer in October 2004
Aurélie Vanheuverzwyn, Executive Director - Data and Methods
A graduate of the ENSAI (National School of Statistics and Information Analysis), Aurélie Vanheuverzwyn joined Médiamétrie in 1999. Currently Executive Director - Data and Methods at Médiamétrie, she oversees Data Science activities and coordinates the Data Privacy and Information Security Officer functions. Aurélie Vanheuverzwyn is also an elected member of the International Statistical Institute (ISI) and the French Statistical Society (SFdS).
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