The greatest designer of French lighting, Robert Mathieu, is still little known to the general public today due to the rarity of his pieces on the market, highly sought after by specialised collectors. Unlike a traditional designer, Robert Mathieu not only designed his lights, but he made them, like an artist, in his studio on rue de Charenton in Paris. Here there is no publisher, but a dropper production close to that of a work of art, sometimes less than eight copies. What is remarkable about Robert Mathieu is on the one hand his unique creativity in France, because he has designed more than 200 models, but also the very high quality of execution of his pieces which are still in perfect condition today. This unpublished monographic work is born after ten years of preparation. Between the beautiful art book and the catalogue raisonne, it presents all the known models of this lighting artist, illustrated by studio photographs and period documentation or non-professional photographic testimonials, because a large number of the creations by Robert Mathieu have never been seen before. Text in English and French.