Background
Colvin was born in Jamberoo, New South Wales and was the son of the Review Edmund Alexander Colvin and Gertrude Elizabeth Reynolds née Huntley.
Colvin was born in Jamberoo, New South Wales and was the son of the Review Edmund Alexander Colvin and Gertrude Elizabeth Reynolds née Huntley.
He was educated at Auburn public school, Newington College (1897–1898), The King"s School (1898–1902) and the University of Sydney. He graduated as a Bachelor of Medicine and Chemistry in 1908.
Following graduation, Colvin was appointed as a resident medical officer at Sydney Hospital and as a pathologist in the following year. He then went into general practice in Orange, New South Wales later specialising in ophthalmic surgery. Colvin was honorary surgeon to His Royal Highness Prince Albert, Duke of York, during his in 1927 Australian tour and to His Royal Highness Prince Henry, Duke of Gloucester, on his 1934 tour.
He was secretary of NSW Western Division of British Medical Association.
In 1937 he was appointed to the Medical Board of New South Wales and from 1944 until 1966 he served on the board of Sydney Hospital. During World War I Colvin served with the field ambulance unit and on administrative staff of the Australian Army Medical Corps of the Australian Imperial Force in Egypt, the United Kingdom, and France.
He rose to the rank of major and was awarded the and mentioned in despatches. During World World War II he was assistant director general of Army Medical Services and an adviser on medical and hospital matters to the director general of Manpower and was promoted to colonel.
Colvin served as an alderman on Orange City Council from 1921 until 1941 and was mayor from 1923 until 1930 and again in 1935.
On retirement he was granted the retention of the title of The Honourable for life. Colvin served on the boards of the Far West Children"s Health Scheme, Legacy Australia and The Spastic Centre.
From 1929 he was a member of the NSW Hospital Commission and served as its vice chairman in 1934. As a member of the New South Wales Legislative Council, Colvin served from 1932 until 1934 as a life appointment under the Constitution Acting and the writ of summons of 7 September 1932. He became an indirectly elected member of the Council in April 1934 and served for 21 years.
He was a member of the Orange Agricultural and Pastoral Society and a councillor of Fairbridge Farm Schools.