Ezra and David used free-time after school to trade on the Italian stock market. At a Juan Gris exhibition in Rome organised by cubist dealer Daniel-Henry Kahnweiler, Ezra and David bought two works – the only pieces sold. Kahnweiler befriended them, selling them works by Picasso, Braque, Gris.[6] With the emergence of the Red Brigades terror group in the 1970s, Milan was perceived as too dangerous, and the family moved again.