World War II
He served in the Scots Guards from 1943–47, where he was made a captain and intelligence officer. He was part of the 3rd (Tank) battalion, which worked mostly in Germany as the enemy was in retreat; his hand was crushed by a tank barrel. Other junior officers in his battalion included future Deputy Prime Minister William Whitelaw, Robert Runcie, a future Archbishop of Canterbury, and future industrialist Hector Laing (United Biscuits).
Greig joined London shipbrokers Horace Clarkson & Co. Ltd in 1948, serving as Director and Managing Director before being named Chairman (1973-1985). He later became Chairman, Horace Clarkson, PLC (1976–93). One of his colleagues at Horace Clarkson was Sir Alexander Glen.
He also served as Director of British gunmaker James Purdey & Sons (1972–2000).
In 1955, he married Monica Kathleen Stourton, daughter of Major Hon. John Joseph Stourton and Kathleen Alice (née Gunther), on 23 September 1955. The marriage produced three sons and one daughter (Louis, Jonathan, Geordie, and Laura, Mrs. Lonsdale).
Carron Greig was a Gentleman Usher for Her Majesty, Queen Elizabeth II, from 1961 until 1995, when he became Extra Gentleman Usher. His son Louis was Page of Honour to the Queen, and his daughter Laura was a Lady-in-Waiting to Diana, Princess of Wales.
Sir Carron Greig died on 11 July 2012, aged 87, at Fleet, Hampshire.
- "Obituary: Sir Carron Greig". London: Daily Telegraph. 16 July 2012.
- Greig, Geordie (18 August 2011). The King Maker eBook: The Man Who Saved George VI. Hodder & Stoughton. ISBN 9781444730265 – via Google Books.
- Maume, Chris (17 July 2012). "Sir Carron Greig: Shipbroker who turned his company into a world leader in its field". London: The Independent.
- "Person Page". thepeerage.com.
- "Yvonne's Royalty Home Page: Diana, Princess of Wales' Ladies-in-Waiting". users.uniserve.com. Archived from the original on 2014-08-15. Retrieved 2012-08-31.