Lord Fairfax's directorships of several companies are as follows: Thomas Miller P and I, and Thomas Miller Defence, 1987–1990; Sedgwick Marine & Cargo Ltd, 1995–1996; British-Georgian Soc. Ltd, 2006; Sovcomflot (UK) Ltd, since 2005; Sovcomflot, 2007. He is Patron of AMUR Tiger and Leopard Charity, 2006. He is a Freeman of the City of London and a Liveryman of the Shipwrights' Company.
In 1982, he married Annabella Ruth Morriss (born 13 January 1957), eldest daughter of Nicholas and of Sarah Gilham Morriss, of Newmarket, by whom he has three sons:[1]
Hon. Edward Nicholas Thomas Fairfax, Master of Fairfax (born 20 September 1984)[1]
Hon. John Frederick Anthony Fairfax (born 27 June 1986)[1]
Hon. Rory Henry Francis Fairfax (born 21 May 1991)[1]
His heir apparent to the title is his eldest son, the Hon. Edward Nicholas Thomas Fairfax.