Director General of MI5

Director General of the Security Service (MI5)
Incumbent Ken McCallum since 30 March 2020; 4 years ago (2020-03-30)
Security Service (MI5)
Residence	Thames House, London, UK
Appointer	Home Secretary
Term length	No fixed term
Inaugural holder	Vernon Kell 1909
Formation	Security Service Act 1989
Website	https://www.mi5.gov.uk/

The Director General of the Security Service is the head of the Security Service (commonly known as MI5), the United Kingdom's internal counter-intelligence and security agency. The Director General is assisted by a Deputy Director General and an Assistant Director General, and reports to the Home Secretary, although the Security Service is not formally part of the Home Office.