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Sir John Allen Clark, (1926–2001), industrialist, was born on 14 February 1926 at 109 Gloucester Terrace, Paddington, London, the oldest child of Sir Allen George Clark and his wife, Jocelyne Anina Marie Louise (b. 1902/3)
He was educated at Harrow School, and after joining the Royal Naval Volunteer Reserve in 1944 he spent one term at Trinity College, Cambridge
On 29 April 1952 he married Deirdre Kathleen Waterhouse and they had one son and one daughter. The marriage was dissolved in 1962, and on 22 May 1970 he married Olivia Ann Pratt. There were one daughter and twin sons from this second marriage.
Clark joined Plessey Co in 1949 as assistant to the general manager of Plessey International Ltd and moved to Ireland in 1950 as director and general manager of Plessey (Ireland) Ltd.
After holding managerial posts in other Plessey subsidiary companies, he joined the board of the Plessey Company Ltd in 1953.
He became general manager of the Plessey Components Group in 1957.
He died in Barbados on 3 December 2001 and was survived by his wife.