Two years later, they opened Galerie Ileana Sonnabend on Quai des Grands Augustins in Paris, where she introduced art by Andy Warhol, Roy Lichtenstein and others, and helped establish a European market for their work. In 1965 they acquired an additional apartment on Ca' del Dose in Venice. In 1968, the couple closed the Paris showroom and moved back to New York. At one time the couple thought that Michael Sonnabend would run the New York gallery while Ileana oversaw their Paris establishment, but he soon found that the art business did not suit him.