Lord Sedwill is Chairman of the Atlantic Future Forum. He is a British diplomat, public policy analyst and senior civil servant who served as Cabinet Secretary to Prime Ministers Theresa May and Boris Johnson and Head of the Civil Service from 2018 to 2020. He has also served as UK 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 Secretary at the Home Office from February 2013 to April 2017.