Sir John Patrick Richardson, (6 February 1924 – 12 March 2019) was a British art historian and biographer of Pablo Picasso. Richardson also worked as an industrial designer and as a reviewer for The New Observer. In 1952, he moved to Provence, where he became friends with Picasso, Fernand Léger and Nicolas de Staël. In 1960, he moved to New York and organized a nine-gallery Picasso retrospective. Christie's then appointed him to open their U.S. office, which he ran for the next nine years. In 1973 he joined New York gallery M. Knoedler & Co., Inc., as vice president in charge of 19th- and 20th-century painting, and later became managing director of Artemis, a mutual fund specializing in works of art. In 1980 he started devoting all his time to writing and working on his Picasso biography. He was also a contributor to The New Yorker and Vanity Fair. In 1993, Richardson was elected to the British Academy and in 1995 he was appointed Slade Professor of Fine Art at the University of Oxford. He was awarded France's Ordre des Arts et des Lettres in 2011 and in 2012 was appointed Knight Commander of the Order of the British Empire. Source: Wikipedia (en)