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John Millington had qualifications as a lawyer, medical doctor and engineer.
Born 11 May 1779, the son of Thomas Charles Millington and Ruth Hill, Hammersmith. Qualified as a lawyer. Became an engineer, working with McAdam. Appointed as a lecturer at The Royal Institution, indicating his academic ability.
1810: Appointed as engineer to West Middlesex Waterworks (8th June 1810), but he proved unsatisfactory and was replaced in January 1811 by William Tierney Clark: 'John Millington , Clark’s predecessor at the West Middlesex Waterworks, was described there, in 1811, as grossly and generally negligent and was dismissed (GLRO Acc2558/WM/1/2p.291)'. He drew up the specification for construction of the Marlow Suspension Bridge 'but the document and his supervision of the work during summer 1829 proved highly incompetent'. The work was taken over by William Tierney Clark. John Millington owned a foundry in Webbs Lane, Hammersmith (see Taylor and Millington). 
1820 Civil engineer. Professor of Mechanics to the Royal Institution.
1824 Professor of Mechanics in the Royal Institution, Vice-President of the London Mechanic's Institute 
Partial transcription only, from memorial stone at Bruton Parish Episcopal Church, Virginia. See source for full text):-
Died in Richmond, Virginia, July 10, 1868
Ninety years of an honoured and useful life on earth closing in on eternal rest.
The worthy friend and associate of men like Sir H Davy, Brewster, Faraday, Herschel and Lord Brougham.
Affection never can forget a friend so genial, generous and true. But faith looks up in hope and rejoices at the blessed end of one whose crowning glory it was to have served the Lord Jesus
Engineer for London and Middlesex [Water Works?]
Professor at Guy's Hospital; at Royal Institution; at London University
Vice President at Mechanics Institute and Royal Astronomical Society.
Chief Engineer of Silver Mines and Superintendent of a mint in Mexico
Professor of Chemistry & Natural Philosophy at College of William & Mary, Virginia.
Professor of Chemistry & Geology at University of Mississippi.
State Geologist of Mississippi.