Date of Birth: 
About Jennifer Guinness
- Mary Jennifer Guinness (née Hollwey; 22 August 1937 – 23 January 2016), was an English-born Irish socialite and member of the Guinness family.She married John Henry Guinness on 9 April 1959, and they had three children: Ian Richard Guinness (b.
- 15 March 1961), Gillian Sarah Guinness (b.
- 8 July 1962) and Tania Caroline Guinness (b.
- 10 February 1966).
- She was a keen sailor and a member of Howth Yacht Club.
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