He adapted the art-historical method initiated by Giovanni Morelli to attribute the specific "hands" (style) of specific workshops and artists, even where no signed piece offered a name, e.g. the Berlin Painter, whose production he first distinguished.
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The London based company Mitchell Beazley was founded in July 1969 by James Alexander Hugh Mitchell (born 20 July 1939 in Epping, England) and John Beazley.