The Nahmads (who say they bought more than 200 Picassos from Kahnweiler's gallery) operate as secondary-market merchants rather than supporters of the arts.
Gregarious, engaging and comfortable in seven languages, David cultivated relationships with the likes of dealer Kahnweiler and billionaire art collector Baron Hans Heinrich Thyssen-Bornemisza, who bought works by Picasso, Kandinsky and Italian futurist Giacomo Balla.