Didier Chabassieu chairs the Management Board of HighCo. He shares the Group’s values of innovation, passion, respect and performance, driven with the ambition to make HighCo the leader on its markets.

Fascinated by the development of digital and new technologies, Didier Chabassieu joined HighCo when it was founded in 1990 after completing a graduate degree in finance. In 1993, he organised the first investor fund-raising operation. He became Chief Financial Officer and a member of the Management Board in 1996 and oversaw HighCo’s IPO.

Since 2000, Didier Chabassieu has been in charge of the Group’s mergers and acquisitions, leading about 30 acquisitions in 10 European countries. He floated a subsidiary on the German market and led the investment in the Group’s minority stakes in the internet start-ups Mediastay (2000), Digitick (2007), Rue du commerce, and so on.

Didier Chabassieu was appointed Managing Director in 2002 and Chairman of the Management Board in 2013.

Shareholding: Didier Chabassieu Holds 372,462 HighCo shares on March 1, 2023.

Other current terms of office and positions held inside the Group: HighCo Venturi (SAS)- Chairman

Other current terms of office and positions held outside the Group: TheCamp (SAS) – Administrator

Other terms of office and positions held over the past five years and expired: None.

Term of office: december 15, 2025

Age: 54

French nationality

Adress: HighCo – 365 avenue Archimède, CS 60346, 13799 Aix-en-Provence Cedex 3.

Cécile Collina-Hue graduated from Paris Dauphine University where she completed her post-graduate degree in corporate finance.

She began her career with DCI group in 1995, working in management control and treasury management.

Joining HighCo in 2002, Cécile Collina-Hue has held a number of positions in administration and finance at the Group before being appointed Deputy Managing Director in 2016.

She became a member of the Management Board as Managing Director in 2017 

Cécile is also responsible for financial communication, and investor and shareholder relations.

Shareholding: Cécile Collina-Hue holds 100,576 HighCo shares on March 1, 2023.

Other current terms of office and positions held outside the Group: None.

Other current terms of office and positions held inside the Group: None.

Other terms of office and positions held over the past five years and expired: None.

Term of office: December 15, 2025

Age: 50

French nationality

Adress: HighCo – 8, rue Catherine de la Rochefoucauld, 75009 Paris.

A graduate of Ecole Supérieure de Commerce (ESC) in Marseille and holding a DESS graduate degree from CELSA, Richard Caillat began his career in 1988 at the French television channel “La Cinq”, where he implemented its interactive policy. He joined the HighCo Group in 1991 and in 1994 became a member of the Management Board. He was appointed Co-Chairman from 2002 to 2006 before being named Chairman in 2006.  

In 2013, Richard Caillat became Chairman of the Supervisory Board.

In 2010, Richard Caillat personally produced his first theatre play, “La Mère” (The Mother). He then created Arts Live Entertainment to give the internet a key role in the production of performing arts shows. He became Chairman of the Board of Directors of the Théâtre de Paris. 

Since 20 December 2017, Richard Caillat has held a seat on the Board of Directors of Olympique de Marseille-Association, alongside other leaders including Basile Boli, Jean-Pierre Chanal (City of Marseille), Djamel Agaoua (Chief Executive Officer of Viber) and Rodolphe Saadé (Chairman and Chief Executive Officer of CMA CGM).

Date of 1st term of office : June 2013 

Shareholding: Richard Caillat Holds 89 722 HighCo shares on March 1, 2023.

Independant member : no 

Other term of office : See PDF file below 

Term of office: 2024 Annual general meeting

Age: 58

French nationality

Nathalie Biderman holds an MBA from INSEAD, a Master’s degree in international law from Georgetown University, a DESS graduate degree and a degree in corporate and tax law from University Panthéon-Assas (Paris II).

Nathalie began her career as a lawyer at the Paris Bar. After advising the Olympic Organising Committee in Albertville on its marketing and communication strategy, she joined the US corporate law firm Cleary, Gottlieb, Steen & Hamilton.

She advised multinational companies in their expansion and restructuring policies in Europe, focusing on the media, communication and information technology sectors.

In 1999, she moved into the internet world as part of the founding team of eDreams, the online travel website that went on to become a leader in Europe.

In 2003, Nathalie Biderman joined the international division of Havas Group before serving as COO for the Euro RSCG Worldwide PR global network.

For nearly 10 years, she advised French and international groups as well as institutions, international NGOs and political and economic figures both within and outside France in their communication strategies.

Bringing together the value of this unique experience and a vast international network built over years, in 2012 she set up the international development strategy consultancy Calya Consultants. The firm targets companies that aim to gain an international dimension, by forming strategic partnerships and investing in innovative technology solutions.

Since January 2022, she has been Of counsel to the Israeli business law firm AYR (Amar Reiter Jeanne Shochatovitch & Co) in its international development.

Nathalie Biderman is registered with the New York Bar and was named Conseiller du Commerce Extérieur de la France (French Foreign Trade Advisor) in 2020. She is also registered with the Israeli Bar as a foreign lawyer.

Date of 1st term of office : June 2013 

Shareholding: Nathalie Biderman Holds 2 HighCo shares on March 1, 2023

Independant member : yes 

Member of the Audit & CSR Commitee : yes 

Member of Compensations & Governance Commitee : yes 

Other term of office : See PDF file below 

Term of office: 2025 Annual general meeting

Age: 56

French nationality

Before joining VMLY&R Paris as CEO, Cécile graduated from the European Business School in 1993 and started her career at TBWA, working mainly on Danone. She then moved on to BBDP & Fils during the inception of the agency in France.

Cécile later joined BBDO in 1999 where she took on leads such as Pepsi Worldwide, Masterfoods Europe and Wrigleys Europe.

To enhance her international experience, Cécile took on the general direction of the BBDO Agency in Turkey for two years before joining Publicis in 2007 as global client officer, managing worldwide brands like Orange, Coca-Cola, Carrefour, Heineken, St Gobain and Engie.

Cécile’s goal has always been to develop the growth of the brands she’s worked for, increase their worldwide coherence, make them more accessible, aspirational and, ultimately, more attractive.

For over two years, Cécile has worked with VivaTech so she is also close to France’s tech and start-up world in France.

Member of Compensations & Governance Commitee : yes 

Term of office: 2023 Annual general meeting

Other term of office: VMLY&R (SAS) – CEO

Âge: 51

Nationalité: French

In September 2019, Dominic Grainger was appointed Chief Executive Officer of the WPP Specialist Communications & PR group of companies. The Specialist Communications & PR division comprises individual businesses with separate and distinct marketing expertise, which operate independently within the group while working closely with WPP clients and sister WPP business units.

From 2006 to 2019, Dominic worked for GroupM, starting as Managing Director of GroupM Europe, Middle East and Africa (EMEA) before becoming CEO. GroupM is the world’s leading media investment company and covers all of WPP’s media businesses.

Between 2002 and 2006, Dominic was CEO of Mediaedge:CIA EMEA, WPP’s leading media agency in the EMEA region.

Dominic Grainger served as President of the European Association of Communications Agencies from 2016 to 2020.

Dominic Grainger is also Chief Executive Officer of WPP The Sports Practice, the global entry point to WPP’s sports marketing services and expertise.

Date of 1st term of WPP 2005 Ltd : October 1999 

Independant member : yes 

Member of the Audit & CSR Commitee : yes 

Shareholding : Dominic Grainger doesn’t hold any HighCo shares as of March 1, 2023 

Other term of office : See PDF file below 

Member of the Audit & CSR Commitee : yes 

Term of office: 2023 Annual general meeting

Age: 57

British nationality

Cyril Tramon is the founder and Chairman of WeShareBonds, a property investment crowdfunding platform.

A graduate of the Ecole Supérieure de Commerce de Rouen (1995), Cyril began his career at EY Corporate Finance. He moved on to J.P. Morgan (London), where he worked in the Loan and High Yield Capital Markets department and then in Acquisition Finance.

In 2000, he was recruited by the French SME Consodata, European leader in marketing databases, as Head of Mergers & Acquisitions, taking on the responsibility of Financial Communication and the monitoring of companies acquired by Consodata.

After the company was sold in 2003, Cyril founded Phillimore, a private equity fund specialised in financing SMEs. He founded WeShareBonds in 2015.

Date of 1st term of office: August 2022

Independant member : yes 

Member of the Audit & CSR Commitee : yes

Member of Compensations & Governance Commitee : yes

Term of office: 2024 Annual general meeting

Other term of office : See PDF file below

Shareholding: Cyril Tramon Holds 1 HighCo share on March 1, 2023

Age: 52

Nationality: French