Top Management Team

Olivier Darrason


Olivier Darrason attended the Institut d’Études Politiques (IEP) in Aix-en-Provence and the École Nationale d’Administration (ENA) (Aguesseau class). He started out as sub-prefect in Guadeloupe (1982) and Var (1983-1986), then became Chief of Staff of the French Ministry of Culture and Communication (1986-1988), and then Secretary-General of SVP, a management consulting company (1990-1993). He was elected MP for Bouches-du-Rhône (Istres/Fos/Martigues/Saint-Mitre/Port-de-Bouc) from 1993 to 1997. He founded CEIS in 1997. He particularly specialises in defence matters and has participated in various major reforms.

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Guillaume Tissier

Managing Director

Guillaume Tissier holds a graduate diploma (DESS) in international business law. He started out as a journalist specialising in economic and legal affairs, then worked as a consultant at DATOPS. In 1997, he joined CEIS’s Risk and Crisis Management department. There, he was particularly involved in consulting assignments in information security and cyber risk analysis. Today he is CEIS’s Managing Director.

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Axel Dyèvre

Associate Director

Axel Dyèvre manages CEIS’s Defence and Security industry activities. He is also in charge of CEIS’s European Office, which he created in 2006. Axel started his career as an officer. He was a strategy consultant from 1995 to 1997, then a Senior Partner at DATOPS (now LexisNexis Business Information Solutions), a company developing information systems, from 1997 to 2005. At DATOPS, Axel designed, rolled out and implemented monitoring and intelligence solutions for government agencies and large companies. Having participated in the CEIS adventure since its origins in 1997, he joined the company’s operations in 2006 to open the European Office in Brussels. Axel holds an advanced degree in business administration from the École Supérieure de Commerce de Paris (ESCP).

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Vincent Riou

Director cybersecurity

After 11 years of experience in project management at the Directorate General of Armaments (DGA), where he was in charge of electronic war and intelligence programmes, Vincent Riou joined the Steria group. There, he supervised the Defence and Security department for 5 years. Vincent has been at CEIS since 2012 and was in charge of directing the company’s business development before taking over the cybersecurity unit in 2017. He holds a diploma in engineering from the École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne) and a master’s degree in business administration from the Institut d’Administration des Entreprises (IAE). He is also an auditor of the 47th national session of the French Institute of Higher National Defence Studies (IHEDN).

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Jean-Jacques Brun

Director of Risk Management

Jean-Jacques Brun joined CEIS in 1999. He was in charge of the media desk and intelligence assignments. Today he directs Risk Management activity. He holds a graduate diploma in defence, geostrategy and industrial dynamics from Université Panthéon-Assas and a master’s degree in political science from Université Paris-Sorbonne.

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Chris Brenot

Director of Human Resources and Quality

Chris Brenot, CEIS’s HRD, holds a graduate diploma (DESS) in international industrial and commercial strategies. She started her career as a parliamentary attaché, then joined CEIS as a consultant in political and parliamentary monitoring. She is also head of quality at CEIS, which has been ISO 9001-certified since 2002.

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Bruno Denoyelle

Director of Public Affairs

After completing doctoral studies in public law and political science, Bruno Denoyelle joined Image & Stratégie Europe, a consulting firm presided over by Thierry Saussez, in 1999. As Associate Director of I&S, he advised managers in the business world as well as elected officials and members of the French government and foreign governments in their public and institutional communication and during national and international electoral campaigns. In 2007, he became the first advisor to the Interministerial Delegate for Communication. From 2011 to 2012, he was a consultant in digital and European matters (French Government Information Service [SIG] Matignon).

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