Henry MacKenzie was born in Edinburgh, Midlothian, Scotland in 1889, the son of William and Isabella McKenzie. He lived at 25 Springwell Place, Edinburgh with his sister Mrs Nicolson. He also had a brother named George.
He engaged as a waiter in the Stewards' Department on board the Lusitania on 30 April 1915 at New York, at a monthly pay rate of £4.05s.00d (£4.25), just in time for her last ever transatlantic crossing. His decision to engage was to prove a costly one for him as he was killed when she was sunk, just one week later. He was aged 26 years.
As his body was never recovered and identified, he is commemorated on the Mercantile Marine Memorial at Tower Hill, London.
His name is spelled McKenzie in the Commonwealth War Graves Commission records.
1891 Census of Scotland, Commonwealth War Graves Commission, Cunard Records, UniLiv. D92/6/1, UniLiv D92/2/297, PRO BT 334.