On September 20, 1940, one of the most famous European art dealers disembarked in New York, one of hundreds of Jewish refugees fleeing Vichy, France. Leaving behind his beloved Paris gallery, Paul Rosenberg had managed to save his family, but his paintings - modern masterpieces by Cézanne, Monet, Sisley, and others - were not so fortunate. As he fled, dozens of works were seized by Nazi forces, and the art dealer's own legacy was eradicated. More than half a century later, Anne Sinclair uncovered a box filled with letters. Drawing on her grandfather's intimate correspondence with Picasso, Matisse, Braque, and others, Sinclair takes us on a personal journey through the life of a legendary member of the Parisian art scene in My Grandfather's Gallery. Rosenberg's story is emblematic of millions of Jews, rich and poor, whose lives were indelibly altered by World War II. Sinclair's journey to reclaim her family history paints a picture of modern art on both sides of the Atlantic between the 1920s and 1950s that reframes twentieth-century art history.