He taught drawing for 25 years in The Cambridge School of Art and painted (Topography and light) until his career came to an end with a joint exhibition between the Fitzwilliam Museum and the school of architecture. He wrote for eight years on the landscapes and settlements of the four East Anglia counties and explored them on foot. In 2003 he was lured by the former Reuters correspondent, Brian Mooney, into walking the shores and inland boundaries of the county. The report of the journey was published as ‘Frontier Country’ (Thorogood 2004)
Jon Has also done various maps for local National Trust estates. He has mapped the Cambridge Preservation Society’s new reserve at Coton for Country Life and drawn a ‘Cambridge in a day’ map to illustrate Jeremy Musson’s article on whats to see in five or six hours.