Mark Sedwill

Mark Sedwill 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 He also served as the United Kingdom National Security Adviser from 2017 to 2020 He was previously the United Kingdoms Ambassador to Afghanistan from 2009 to 2010 and the NATO Senior Civilian Representative in Afghanistan in 2010 He was the Permanent UnderSecretary of State at the Home Office from February 2013 to April 2017