In 1989 The Museum of Modern Art brought together, in the exhibition Picasso and Braque: Pioneering Cubism, more than four hundred works from the period 1907-14. At the same time, William Rubin, the director of this historic exhibition, organized an extraordinary meeting of twenty-seven of the world's foremost authorities on early twentieth-century painting, in an effort to advance scholarly understanding of the unique collaboration between these two artists.