Howard , John , 1726?-1790 , philanthropist and penal reformer Blackstone , Sir , William , 1723-1780 , Knight , legal writer and judge Eden , Sir , William , 1st Baronet , 1744-1814 , penal reformer and diplomatist Fothergill , John , 1712-1780 , physician and naturalist Whatley , George , fl 1780 , Treasurer of the Foundling Hospital

Howard , John , 1726?-1790 , philanthropist and penal reformer Blackstone , Sir , William , 1723-1780 , Knight , legal writer and judge Eden , Sir , William , 1st Baronet , 1744-1814 , penal reformer and diplomatist Fothergill , John , 1712-1780 , physician and naturalist Whatley , George , fl 1780 , Treasurer of the Foundling Hospital

John Howard, prison reformer and author of The State of the Prisons in England and Wales, with Preliminary Observations, and an Account of some Foreign Prisons, Sir William Blackstone, the High Court judge, and William Eden, member of Parliament and author of Principles of Penal Law, were responsible for the 1779 Penitentiary Act "to explain and amend the Laws relating to the Transportation, Imprisonment, and other Punishment of certain offenders ---" (19 Geo. III, c.74). As an alternative to transportation this provided for the building of two penitentiaries, one for males and one for females, where "solitary Imprisonment, accompanied by well regulated labour, and religious Instruction" "might be the means, under Providence, not only of deterring others from the Commission of the like Crimes, but also of reforming the Individuals, and inuring them to Habits of Industry".

The three supervisors appointed to arrange for the purchase of a site and the erection of the penitentiaries were John Howard, Dr John Fothergill, physician and botanist, and George Whatley, Treasurer of the Foundling Hospital. Despite their efforts, the supervisors failed to find a site acceptable to the Lord Chancellor, the Speaker of the House of Commons, the judges, and the Lord Mayor of London. John Fothergill died in December 1780 and John Howard shortly afterwards resigned. Three new supervisors were appointed to join George Whatley. Although they agreed on a site and on a plan for a penitentiary, no prison was ever built.

In 1784 the Government obtained a new Transportation Act. The Gilbert Acts of 1782 and 1784 allowed local justices to build houses of correction. Local Prison Acts also gave counties the powers to build new prisons. Ironically the Middlesex House of Correction was built between 1788 and 1794 at Cold Bath Fields, Clerkenwell, in the vicinity of the site originally preferred by the Penitentiary Act supervisors, close to New River Head and between Grays Inn Road and Bagnigge Wells Road.