John Horace Ragnar Colvin, CMG (18 June 1922 – 4 October 2003) was a British sailor, intelligence officer, banker and military historian.
Brenda Colvin (1897–1981)[2] was an important landscape architect, author of standard works in the field and a force behind its professionalisation.
He emerged from undercover work to accept the surrender of the Japanese command in Saigon on Japan's capitulation, and remained in the South Vietnamese capital for a year.
His most high-profile postings, however, were Consul-General in Hanoi from 1966 to 1967 at the height of the American bombing campaign in the Vietnam War, where he was succeeded by Brian Stewart; HM Ambassador to Mongolia from 1971 to 1974; and head of the SIS station in Washington 1977–1980.
[citation needed] On retirement from SIS, Colvin advised David Rockefeller for eight years in Hong Kong as a vice-president of the Chase Manhattan Bank.