After being active in the art business in London and Paris, Stern founded his first gallery on Brighton Way in
Beverly Hills in 1982. In 1994, he relocated to his current location on Melrose Avenue in West Hollywood. After moving to the Melrose location he exhibited Modern and Impressionist work including solo shows for Matisse, Picasso, Leger, Villon and Kupka. He has acquired and placed works by artists of the late 19th and 20th centuries, including Monet, Renoir, Pissarro, Sisley, Cassatt, Morisot, Degas, Van Gogh, Braque, Chagall, Modigliani, Giacometti, de Kooning, Dubuffet, Francis and Warhol. While Stern continues to be active in the secondary market, his gallery is focused on leading West Coast
hard-edge abstractionists of the twentieth century (representing the estates of
Karl Benjamin,
Lorser Feitelson, and
Helen Lundeberg). The gallery represents a stable of contemporary artists as well, many of whom create work which continues the legacy of hard-edge abstraction. Over time Stern expanded his specialties to include Latin American art, particularly that of Mexican painter and muralist
Alfredo Ramos Martínez, who is considered by many to be the "Father of Mexican Modernism". Stern founded the Alfredo Ramos Martínez Research Project to promote and protect the legacy of the artist. He serves as the director of the project, which is currently compiling the catalogue raisonné for Ramos Martínez. Stern’s advocacy reestablished the reputation of Ramos Martínez, resulting in a major retrospective at the
Museo Nacional de Arte (MUNAL) in Mexico City in 1992. ==Involvement and awards==