Son of Heinrich Moos and Rosalie Bloch, he spent his childhood in Karlsruhe where his father ran a xylography and electroplating workshop for the postcard industry.

With his sister Hedwig Moos, he opened a store selling picture frames and illustrated postcards at 29 rue du Rhône, the same address as the Swiss painter Ferdinand Hodler.

In order to satisfy these new buyers, Max Moos diversified his offer by proposing, on a permanent basis, impressionist and post-impressionist works (Pierre Bonnard, Paul Cézanne, Vincent Van Gogh, Claude Monet, Camille Pissarro, etc.)

In 1916, in collaboration with Paul Vallotton,[11] agent of the Paris gallery Bernheim-Jeune set up in Lausanne, presenting the Exposition de peinture française moderne.

[1] En May 1918, Moos organised L'Exposition Ferdinand Hodler accompanied by a catalog printed in 3 000 copies, and authored by famous journalists Johannès Widmer, Carl-Albert Loosli et Lucienne Florentin.

[16] In March 1922, Max Moos moved to Paris to open a new gallery at 14 rue de la Boëtie, where the art market seemed to be flourishing.

He will also present an exhibition entitled 21 artists of the Italian Novecento sponsored by an impressive Honorary Committee chaired by Benito Mussolini.

In order to promote the project, the journalist Lucienne Florentin was asked to write articles and a monograph on the artist and to organize a large François Barraud exhibition.

A few exhibitions were still held at Rue du Léman 3: the painter Paul Albert Mathey in 1940, Lucien Schwob[20] in 1941 and the auction of furniture from the collection of Mr. and Mrs. Moos[21] to finance his parents' stay in the United States Pendant son exil à New York, Moos continuera la promotion de sa collection, en organisant des expositions F. Barraud à la Knoedler Gallery,[22] F. Hodler à la Durand-Ruel Galleries[23] et au San Francisco De Young Museum (7-8 September 1940).

An invitation card still mentions a Pierre Jacques exhibition[24] le 15 avril 1967, au quai du Mont Blanc 31.

D. Cosandier... 1932 : Collections of Mrs Mary C. Blair, Chambésy and of the countess A. d'Oustinoff, Nice : paintings, watercolors, drawings and engravings, objects of art and furnishings, furniture... : the sale of which will take place in Geneva, Galerie Moos, 3, rue du Léman, on 2 and 3 December 1932... by the ministry of Me Ch.

1934 : Paintings, watercolors, drawings, objects of art and furnishings, antique and modern furniture... : collections of Mr Charles Amann, antique dealer, private collection of Mrs Mary C. Blair whose sale will take place in Geneva, Galerie Moos, 3, rue du Léman, on 21 and 22 September 1934... by the ministry of Me Ch.

Cosandier under the direction of Mr. W.-S. Kundig 1935 : Paintings of the German, Flemish, French, Dutch and Italian schools from the 15th to the 19th century, works by Avercamp, Backhuyzen, Berghem... coming from the private collection of Dr L. D. Van Hengel... and whose sale will take place in Geneva, Galerie Moos, 3, rue du Léman, on May 25, 1935 : by the ministry of Me Ch.

1935: Paintings, watercolors, drawings, engravings and miniatures, objects of art and furniture... coming from the domain of Beaulieu, Geneva belonging to Miss Louise Chauvet and to Mr. Maurice Chauvet and of other origin of which the sale will take place in Geneva, Gallery Moos, 3, rue du Léman, on September 27 and 28, 1935 : by the ministry of Mr. Ch.