[3] Mortier was discovered by Marcel Gascoin, a central figure in French post-war design who surrounded himself with young talent to produce furniture sets.

[2] In 1949 Gascoin founded ARHEC, Aménagement rationnel de l'habitation et des collectivités (Rational Improvement of Housing and Communities), to produce and distribute furniture sets.

[2] That year he formed an association called the Atelier de Recherche Plastique (ARP: Plastic Research Workshop) with Pierre Guariche and Joseph-André Motte, whom he had met in Gascoin's studio.

[5] The ARP had an exhibit at the Salon des arts ménagers in 1954, where Mortier showed a modular storage unit with an ingenious assembly system that was the origin for a range of products by Minvielle, a leading brand in the 1950s and 1960s.

[2] Mortier became artistic director of the store La Maison Française 55, and designed many products for leading manufacturers including chairs for Steiner and lights for Disderot and Verre Lumière.

[6] Mortier developed a child's room in the 1970s that was considered very avant-garde at the time, with flat colored surfaces that define the different uses of the built-in units: storage, work and play.