Carr was born in Arkhangelsk in 1899 where his father managed a sawmill. He was educated at Haileybury.
After joining the Army, Carr was sent to northern Russia as an interpreter in 1919.
He was demobilised later the same year, and was given a temporary post working for MI(1c) in Helsinki. He was subsequently appointed an Assistant Passport Control Officer, a cover position for work in the intelligence services that would become MI6.
Car was recalled to Britain in May 1945, and was appointed Controller, Northern Area in September 1945.
- Keith Jeffery, MI6: The History of the Secret Intelligence Service 1909-1949, Bloomsbury, 2010, p.191.
- Keith Jeffery, MI6: The History of the Secret Intelligence Service 1909-1949, Bloomsbury, 2010, p.553.