Later, in New York in the late 1970s, Mosset undertook a long series of monochrome paintings, during the heyday of Neo-expressionism. He became a founding member of the New York Radical Painting group, radical referring both to an implied radical social stance, as well as a returning to the radical “root” of painting. This re-assertion of social relevance for abstraction, and even the monochrome, hadn't been emphasized to such a degree since Kazimir Malevich and Alexander Rodchenko.
