The gallery also represented Marc Chagall, Alberto Giacometti, Francis Bacon and Wassily Kandinsky.
Giacometti and Bacon both painted his portrait.Dupin wrote Miró's biography, numerous monographs on the artist's work, and was empowered by Miró's family to be the sole authenticating authority of the artist's work; a role that made him much sought after by collectors.
In 1987, Dupin was the curator of a retrospective of Miró's work at the Solomon R.
Guggenheim Museum, the first such retrospective in New York since 1959.