Richardson’s grandest and most acclaimed project was his multivolume biography of Pablo Picasso, the first part of which was published in 1991. (Two more volumes have been put out since; a fourth is expected to follow, though a publication date has not yet been set.) In 2008, Richardson was asked what made his biography different from books on the painter. He told Artinfo, “The fact that I knew him well and he opened up to me.” – ARTnews