Looking back at the history of the pioneering dealership in post-war art, plus a thought-provoking new installation in Madison Square Park and Caravaggio's The Martyrdom of Saint Ursula

The dealer will show 12 works by the German-British painter spanning 50 years of his career

The firm is winding down its operations globally and will sell off an estimated $250m of art

Marlborough gallery and a retired Guimet Museum curator are accused of bribery in their promotion of the artist Chu Teh-Chun—but say they broke no rules