Since 1971, Alain de Monbrison has specialized in the primitive art of Africa and Oceania. An expert at the Paris Court of Appeal, for the Syndicat Français des Experts professionnels en Œuvres d'Art, member of the Syndicat National des Antiquaires. He has organised numerous exhibitions at his gallery in the rue des Beaux-Arts.

He works frequently with European and American museums. In 1996, the Barbier-Mueller museum in Geneva appointed him to sell its collection of Nigerian objects to the French national museums.

As an expert, he participated in several public sales at the Hôtel Drouot. Among them, the Pierre Harter sale in June 1995, Van Bussel in 1996, Solvit in 1998. In 2001, the Hubert Goldet sales at the Maison de la Chimie, with François de Ricqlès, and René Gaffé at the Christie's France sale rooms, both set significant world records.

Alain de Monbrison's gallery is open to anyone wishing to sell African, Oceanic and Amerindian art at the highest market price.