Painting. Professor Stephen Hawking, by Yolanda Sonnabend, 1985. Signed brc. Oil on canvas; 101x76cm, in frame 105.5x80x4cm. The artist's first impression of him: sketch for portrait. Sitter is seated in wheelchair, making visible effort to control his mobility; he has motor neurone disease but at this time is still able to speak without the aid of a computer; shown with mouth open. (The final version, in National Portrait Gallery London, has mouth shown closed)