He was one of the ecclesiastical commissioners for Ireland, a governor of Simpson's Hospital, and vice-chairman of the Dublin Exhibition Palace.
Lord Iveagh married Miranda Daphne Jane Smiley, daughter of Major Michael Smiley, of Castle Fraser, Kemnay, Aberdeenshire, on 12 March 1963.
An Anglo-Irish aristocrat, he is the son of Benjamin Guinness, 3rd Earl of Iveagh and Miranda Guinness.
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She is a daughter of Patrick Benjamin Guinness (1931-1965) (himself half-brother of the Aga Khan IV) and his wife (and stepsister), the former Dolores Guinness, Dolores Maria Agatha Wilhelmine Luise, Freiin von Fürstenberg-Hedringen (1936-2012), herself the daughter of the socialite Gloria Guinness (1912-1980) and Count Franz-Egon von Fürstenberg-Herdringen (1896-1975).