Who is the US copyright representative for Les Heritiers Matisse ?
He exhibited Joan Miró , Marc Chagall , Alberto Giacometti , Jean Dubuffet , André Derain , Yves Tanguy , Le Corbusier , Paul Delvaux , Wifredo Lam , Jean - Paul Riopelle , Balthus , Leonora Carrington , Zao Wou Ki , Sam Francis , sculptors Theodore Roszak , Raymond Mason and Reg Butler , and several other important artists , including the work of Henri Matisse .