Paul Rosenberg’s space at 21 rue la Boétie flourished in the 1920s and 1930s. During this time, the dealer exclusively represented numerous artists, including Georges Braque, Marie Laurencin, Fernand Léger, André Masson, Henri Matisse, and Pablo Picasso, whom Rosenberg represented for over two decades. In 1935 he opened a second space in London to attract a growing international audience. Between these two locations, Rosenberg became known as one of the most important sources of nineteenth and twentieth-century French painting, placing works in museums in both Europe and the U.S.
In 1940, with the onset of World War II, Paul Rosenberg moved to New York where he continued Paul Rosenberg & Co. at a gallery space on East 57th Street, and later moved the gallery to East 79th Street. Paul’s son, and Marianne Rosenberg's father, Alexandre P. Rosenberg (1921–1987) remained in Europe to fight with the Free French Forces. In 1946, Alexandre joined the New York gallery to continue his father’s legacy as a dealer and collector, and became the founding President of the Art Dealers Association of America in 1962.
Today, the gallery represents the estates of Fred Stein and Marguerite Louppe & Maurice Brianchon as well as the contemporary artists Tom John and Audé Herledan. Marrianne Rosenberg is a comittee member of the Fondazione Giacomo Manzù, the Association des Amis de Serge Charchoune, and represents the Comité Léger within the United States. Among others, the gallery also has works available by Ann Christopher, Joseph Csáky, Serge Férat, Françoise Gilot, John Graham, Henri Hayden, Marie Laurencin, Henri Laurens, Fernand Léger, and Léopold Survage.
