Wynn-Jones studied at Lancing College and the University of Oxford, and is a writer, editor and publisher. His father worked as a Church of England vicar in Tivetshall and Redenhall with Harleston, and his mother was a teacher at Diss Grammar School. Wynn-Jones married Delia Smith in 1971 in Stowmarket, Suffolk. Wynn-Jones established New Crane Publishing, which produced some of Smith's books as well as the Sainsbury's magazine, which Wynn-Jones edited. In 2005, New Crane Publishing was sold to Seven Publishing for around £7 million; Smith had been working as a consultant for the publishing company. Wynn-Jones was the former Deputy Editor of the Daily Mirror, during which time in 1969, Delia Smith became the cookery writer for the magazine. In 1972, George Gale appointed Wynn-Jones as Deputy Editor of The Spectator, and he has also worked for the Twentieth Century and Nova magazines. Wynn-Jones has also authored many books, including The Cartoon History of Britain, George Cruikshank: His Life and London about George Cruikshank, and 100 Years on the Road: A Social History of the Car. In her autobiography, Brigid Keenan thanked Wynn-Jones for asking her to write a column on expats for him in the Sainsbury's magazine.
Wynn-Jones attended his first Norwich City F.C. match in 1953. In 1997, Wynn-Jones became the current joint majority shareholder of Norwich City F.C. with his wife Delia Smith. In Tales From The City, a series of books about the history of Norwich City F.C. published in 2015, Wynn-Jones says that in 1996 former majority shareholder Geoffrey Watling invited them to make a loan to the club, in exchange for board of directors positions at the club. They later purchased Watling's shares in the club, making them majority shareholders, and in 1998, Wynn-Jones and Smith owned 63% of the club's shares. By 2006, their share in the club had reduced to 57%, and in 2015 their share had reduced again to 53%. In 2013, the pair wrote off £2.1 million of debt that the club owed them, as part of a £23 million reduction in the club's deficit; it has been estimated that Wynn-Jones and Smith have invested around £12 million into the club since 1996. In the 2015–16 season, Wynn-Jones and Smith's estimated worth was reportedly £23 million, the least of any Premier League club owners. Roy Waller wrote of Wynn-Jones and Smith that they are "crucial to the club's success", as they invested a lot with "very little return"; Waller noted that Wynn-Jones attends every Norwich match, both home and away, and often chose to sit with the fans during matches, rather than being in the directors' box.
- Lakey, Chris (12 May 2016). "Is now the time for Norwich City owners to think of selling up?". Eastern Daily Press. Retrieved 24 July 2016.
- "Key People". Norwich City F.C. Retrieved 24 July 2016.
- "Profile: Delia Smith". The Independent. 11 December 1999. Retrieved 2 July 2016.
- Molloy, Mike (March 2016). The Happy Hack - A Memoir of Fleet Street in its Heyday. John Blake Publishing. Retrieved 3 July 2016.
- "Delia runs wild in the bookshop". The Independent. 16 October 1995. Retrieved 24 July 2016.
- "An audience with Delia Smith". BBC Radio Norfolk. 29 March 2007. Retrieved 24 July 2016.
- "Norwich City Joint Majority shareholder Michael Wynn Jones pays tribute to his mother". Eastern Daily Press. 1 January 2012. Retrieved 24 July 2016.
- Patton, Robert L. (1974). George Cruikshank: A Revaluation. Princeton University Press. 35. p. 14. Retrieved 2 July 2016.
- Bee, Peter Wynter (July 2008). People of the Day 3. People of the Day. p. 103. Retrieved 9 July 2016.
- Goodison, David (8 August 1995). "All gloss and no substance". The Independent. Retrieved 16 October 2009.
- "Michael Wynn Jones". Bloomberg. Retrieved 2 July 2016.
- Busfield, Steve (11 January 2005). "Millions added to Delia Smith's stock pot". The Guardian. Retrieved 16 October 2009.
- Lee, Adrian (14 May 2011). "The two Delia Smiths". Daily Express. Retrieved 3 July 2016.
- Editors of the American Heritage Dictionaries (2005). The Riverside Dictionary of Biography. Houghton Mifflin Harcourt. p. 737. Retrieved 9 July 2016.
- Berger, Michael L. (2001). The Automobile in American History and Culture: A Reference Guide. Greenwood Publishing Group. p. 242. Retrieved 3 July 2016.
- Keenan, Brigid (March 2011). "Introduction". Diplomatic Baggage: The Adventures of a Trailing Spouse. Hachette UK. Retrieved 2 July 2016.
- "Norwich legend Watling has died". BBC Sport. 17 November 2004. Retrieved 27 March 2007.
- "Nigella Lawson joins team to save football club". London Evening Standard. 25 March 2011. Retrieved 2 July 2016.
- "Safeguarding Norwich City's future was an offer Michael Wynn Jones and Delia Smith could not refuse". Eastern Daily Press. 13 October 2015. Retrieved 2 July 2016.
- Hickman, Martin (21 August 2006). "Britain's richest chefs". The Independent. Retrieved 3 July 2016.
- "English Premier League Teams Owners". Live Sports Reviews. 24 November 2015. Retrieved 24 July 2016.
- Osborne, Chris (10 October 2013). "Norwich City erase £23m of debt to secure 'rosy future'". BBC Sport. Retrieved 2 July 2016.
- Hough, Andrew (11 May 2011). "Delia Smith: Britain's 'first lady' of cooking". The Daily Telegraph. Retrieved 3 July 2016.
- "Premier League's richest owners: How much is YOUR club's ownership worth?". Daily Mirror. 12 August 2015. Retrieved 3 July 2016.
- Watts, Jack (19 April 2016). "Revealed: Which Premier League owner is richest? And how wealthy is your club's chief?". The Daily Star. Retrieved 2 July 2016.
- Waller, Roy (October 2004). Waller's World. Grice Chapman Publishing. pp. 66–67. Retrieved 3 July 2016.