1/22/2015: My Grandfather’s Gallery - Anne Sinclair An ode to a neat man Paul Rosenberg who, as a gallery owner in 20 th century France and the US, was instrumental in bringing modern art to its success. He represented Picasso, Matisse, Braque, to name but a few. He led the way and she tells a nice touching story about his ups and downs. She had access to lot of family letters and archives of various painters.