Published to accompany the highly anticipated exhibition, 'Leonardo da Vinci: Painter at the Court of Milan', at the National Gallery, London, this extended volume of the 'Technical Bulletin' documents new research undertaken on the life and work of Leonardo. It includes an analysis of his time in Verrocchio's workshop, where he adopted the new technique of oil painting; an article on the recent conservation and redisplay of the London version of 'The Virgin of the Rocks'; and examples of Leonardo's painting practice and influence while he was court painter to the Duke of Milan, Ludovico Sforza.