Olivier Theunissen and Nicolas de Ghellinck, both members of the Chambre Royale des Antiquaires et Négociants en Oeuvres d'Art de Belgique (Royal Chamber of Antique Dealers and Art Dealers of Belgium), have been based in the Sablon district of Brussels since 1992 and specialise in French furniture and works of art from the 17th and 18th centuries.