At the age of ten, in 1767, he began his education at Eton College, a famous public school in Berkshire.
In 1779, John "Mad Jack" Fuller, at the age of 22, was captain of a light infantry company in the Sussex Militia.
On 27 February 1810 he was involved in an incident with the Speaker in Parliament, which led to him being seized by the Serjeant-at-Arms and to public disgrace.
In 1811, a pyramid-shaped building, often referred to as "The Pyramid", was erected in the churchyard of the Church of St. Thomas à Becket in Brightling[6] as a future mausoleum for Jack Fuller.
In 1828 he established the Fuller medal of the Royal Institution and in early 1833 he founded the Fullerian Professorship of Chemistry to which Michael Faraday was appointed as the first professor.
[8] In 1818, Fuller built the Observatory at Brightling which had been designed by Robert Smirke, and in 1822, he endowed Eastbourne in Sussex with its first lifeboat.
Unsubstantiated sources claim that in 1828, he financed the building of the Belle Tout Lighthouse, on the cliff at Beachy Head, near Eastbourne.
On Thursday, 18 September 1828, Jack Fuller bought Bodiam Castle for 3000 guineas at auction to save it from destruction.