His father, a surveyor at Twickenham, was Head Gardener at Kew to Augusta, Dowager Princess of Wales, and superintendent of the Royal Gardens at Richmond Lodge.
[3][4] In July 1794 the Kew kitchen garden was closed and John resigned.
[5] In 1769 he met Augusta's nephew, Ernest II, Duke of Saxe-Gotha-Altenburg, who was the same age, who took him to Gotha.
John remodelled the gardens at Pitzhanger Manor for Sir John Soane, creating a curving ‘serpentine’ lane, a rustic bridge, and a plantation.
Haverfield also visited other Soane schemes: Hinton Saint George (1796), Bentley Priory (1798), Ramsey Abbey (1804), Moggerhanger House (1809 & 1810).