He was educated at Harvard and Trinity Hall, Cambridge where he was President of the Cambridge Union Society in 1919. He was called to the Bar at Inner Temple in 1921 and joined the Northern Circuit. He became a KC in 1925. He was also Judge of Appeal in the Isle of Man from 1938 to 1947 - the youngest ever to hold such position.
Invested to the Privy Council in 1951, he was Lord Justice of Appeal from 1951 to 1960. On 7 January 1960, he was appointed Lord of Appeal in Ordinary and was made additionally a life peer with the title Baron Morris of Borth-y-Gest, of Borth-y-Gest in the County of Caernarvonshire. In 1975, he retired as Lord of Appeal and became a member of the Order of the Companions of Honour.