France leadership
Gilles Betthaeuser

Founder of AOS in 1997 (acquired by First Service – parent company of Colliers International, in October 2014), his entrepreneurial spirit and foresight fuelled his ability to take a small independent Parisian company, specializing in space planning and grow it into a global organisation, that today provides high-level occupier-focused real estate services.

Gilles contributed to the set up of the Tenant Rep business in France and is involved in many big and complex transactions in Paris. Due to his background, he is executing sponsor of Occupier Services within Colliers International for the EMEA region.


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Xavier Mahieu
Directeur General Pole Transaction

I started my career in real estate as an expert (valuation) in 1996 at BOURDAIS. In 1998 I joined CBRE as a property consultant and became the Head of the Paris Office Leasing in 2001. I joined CBRE Global Investors in 2005 and spent 3 years developing business in Europe. In 2009 I joined the Seniors Advisorea team of CBRE and became the Head's team in 2012. In 2016 I became the Head of CBRE Business Line of Paris Region Office Adgency and Tenant Rep as Executive Director.

In september 2017 I joined Colliers Internationnal France to create and develop the adgency busines line. 

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Stephanie Faure
Directrice Pole Advisory

After an experience in strategy consulting and management in the Real Estate sector at BearingPoint and previous experience in real estate development, Stéphanie joined Colliers to take responsibility for the strategy and organization consulting practice.

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Pierre-Gilles Solvit
Directeur General Pôle Projet

Architect in Paris
Project Manager in Paris
Sales Manager in Paris
Operation Manager in Paris (AOS Group)
General Manager in Switzerland (AOS Group)
General Manager in Belgium (AOS Group)

General Manager Projects and Operations in Paris (110 p. in my team)

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Philippe Donikian
Directeur des Ressources Humaines

After 25 years of experience as HR Director in major groups (SFR and bioMérieux), Philippe is in charge of managing and coordinating support functions.

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