He was educated at Eton College and served with the Scots Guards during World War I, winning the Croix de Guerre and reached the rank of captain.
His brother, George Boyd-Rochfort (1880–1940), also served with the Scots Guards during World War I and won the Victoria Cross.
He trained for King George VI and then Queen Elizabeth II from 1943 until he retired in 1968, the same year in which he was knighted.
[1] His biggest royal wins were Pall Mall in the 1958 2,000 Guineas, Hypericum in the 1956 1,000 Guineas, Aureole in the 1954 King George VI and Queen Elizabeth Stakes and Canisbay in the 1965 Eclipse Stakes.
He was champion trainer in 1937, 1938, 1954, 1955 and 1958, and other top successes for his stable were the Ascot Gold Cup wins of Precipitation and Zarathustra, and in the later stages of his career he won the Goodwood Cup four times between 1962 and 1966.