Architecturally, Sert is probably best known for some celebrated buildings to display collections of modernist art, and for the homes and studios he designed for close friends like Chagall, Braque, and particularly Miró. He started the first graduate programme in urban design, and executed plans for cities including Havana, Bogotá and Medellin. Giedion, Gropius, Breuer and Le Corbusier were close colleagues. His wide range of artist friends included Bonnard, Matisse, Kandinsky, Léger, Ernst and Giacometti. He lived at Calder’s when he first arrived in the U.S., and corresponded with a circle ranging from Buñuel and Dalí to Nervi and Neutra.