Mark Sedwill

The Right Honourable The Lord Sedwill GCMG FRGS PC
Sedwill, circa 2013
Cabinet Secretary Head of the Home Civil Service
In office 24 October 2018 – 9 September 2020[a]
Prime Minister	Theresa May Boris Johnson
Preceded by	Sir Jeremy Heywood
Succeeded by	Simon Case
United Kingdom National Security Adviser
In office 13 April 2017 – 16 September 2020[1]
Prime Minister	Theresa May Boris Johnson
Preceded by	Sir Mark Lyall Grant
Succeeded by	David Quarrey (acting)
Director, Afghanistan & Pakistan of the Foreign and Commonwealth Office
In office 2010–2012
Prime Minister	David Cameron
Preceded by	Karen Pierce
Succeeded by	Richard Crompton
NATO Senior Civilian Representative in Afghanistan
In office January 2010 – June 2010
Prime Minister	Gordon Brown David Cameron
Preceded by	Fernando Gentilini
Succeeded by	Simon Gass
Member of the House of Lords Lord Temporal
Incumbent
Assumed office 21 October 2021 Life peerage
Personal details
Born	Mark Philip Sedwill (1964-10-21) 21 October 1964 (age 59) Ealing, England
Political party	Crossbencher
Alma mater	University of St Andrews (BSc) St Edmund Hall, Oxford (MPhil)

Mark Philip Sedwill, Baron Sedwill, GCMG, FRGS, PC (born 21 October 1964) is a British diplomat and senior civil servant who served as Cabinet Secretary and Head of the Home Civil Service to Prime Ministers Theresa May and Boris Johnson from 2018 to 2020.^[2] He also served as the United Kingdom National Security Adviser from 2017 to 2020. He was previously the United Kingdom's Ambassador to Afghanistan from 2009 to 2010 and the NATO Senior Civilian Representative in Afghanistan in 2010. He was the Permanent Under-Secretary of State at the Home Office from February 2013 to April 2017.

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