He was born in London the son of John Skynner of Great Milton, Oxfordshire and educated at Westminster School and Christ Church, Oxford, where he matriculated in 1742. He entered Lincoln's Inn in 1739 to study law and was called to the bar in 1748.
He became attorney-general to the Duchy of Lancaster from 1770 to 1777, made K.C. in 1771 and a bencher at Lincoln's Inn the same year. He was appointed recorder of Woodstock from 1771 to 1780, second justice of Chester from 1772 to 1777 and recorder of Oxford from 1776 to 1797.
He was elected Member of Parliament for New Woodstock from 1771 to 1777. He gave up his seat in 1777: he was made a serjeant-at-law on 27 November 1777 and on 1 December was appointed Chief Baron of the Exchequer, a post he held until 1787, after which he was made a Privy Counsellor. He was knighted on 23 November 1777.
He retired in 1886 to the Great House in Great Milton which had inherited from his mother. He died at Bath in 1805 and was buried in the south aisle of Great Milton church. He had married Martha, the daughter of Edward Burn, with whom he had a daughter, Frederica, who married Richard Ryder, the Home Secretary.
- "SKYNNER, John (1724-1805), of Great Milton, Oxon". History of Parliament Online. Retrieved 20 August 2016.
- Foster, Joseph (1888–1892). . Alumni Oxonienses: the Members of the University of Oxford, 1715–1886. Oxford: Parker and Co – via Wikisource.
This article incorporates text from a publication now in the public domain: Barker, George Fisher Russell (1897). "Skynner, John". In Lee, Sidney (ed.). Dictionary of National Biography. 52. London: Smith, Elder & Co. p. 360.
|Parliament of Great Britain|
Lord Robert Spencer
| Member of Parliament for Woodstock
With: William Gordon 1771–1774
William Eden 1774–1777
Sir Sydney Smythe
| Chief Baron of the Exchequer
Sir James Eyre
| Puisne Justice of Chester
Sir Francis Buller