High Quality Content by WIKIPEDIA articles! Colonel Valentine Patrick Terrell Vivian CMG CBE (1886–1969) was the vice-chief of the SIS or MI6 and was the first head of its counter-espionage unit, Section V. It was Vivian, who while attempting to introduce new blood into the service, selected Kim Philby who was later to become notorious as "The Third Man" double agent and who defected to the Russians causing considerable harm to the system he had infiltrated.