John Kinder Gowran Shearman (pronounced "Sherman"; 24 June 1931 – 11 August 2003[1]) was an English art historian who also taught in America. He was a specialist in Italian Renaissance painting, described by his colleague James S. Ackerman as "the leading scholar of Italian Renaissance painting",[2] who published several influential works, but whose expected major book on Quattrocento painting, for the Penguin/Yale History of Art series (commissioned in 1984, and still a gap in the series in 2019),[3] never appeared.[4] However, what is widely acknowledged as his most influential book, on the concept of Mannerism, published in 1967, is still in print.[5][6]