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August 1986: Chief of Staff of the Governor of Antwerp
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1990: International Diamond Broker at Bonas & Co., the number one DTC broker of De Beers
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1992: Managing Director of the Antwerp Diamond Bourse
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1999: Managing Director to the HRD (now AWDC - Antwerp World Diamond Centre)
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2000: Co-founder of the Kimberley Process Certification Scheme
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2007 – January 2018: Special Advisor–Diamonds at Dubai Multi Commodities Centre (DMCC)
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Author of the Master Plan for Dubai’s diamond sector (between 2006 and 2011 Dubai's diamond trade grew from 10 billion to 39 billion US dollars)
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2007 – present: President of the International Diamond Laboratories (IDL)
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2009 – January 2018: Chairman of the Board of Directors of the Dubai Diamond Exchange (DDE)
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2012 – present: Member of the Executive Committee - World Federation of Diamond Bourses (WFDB)
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2016 – January 2018: Chair of the Kimberley Process Certification Scheme Monitoring Team for the Central African Republic
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2018 – April 2020: President of the World Diamond Mark (WDM)
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Present: Honorary Chief of Staff of the Governor of the Province of Antwerp
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Present: Honorary Chairman of the Dubai Diamond Exchange
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Present: Lead of the Technical Expert Group in the establishment of the Angola Diamond Exchange