National Security Adviser

Mark Sedwill


Mark Philip Sedwill CMG was appointed National Security Adviser to the Prime Minister in April 2017.

Joining the Foreign and Commonwealth Office in 1989, Mark has been held a number of high profile positions, including as Ambassador to Afghanistan in 2009, and as NATO’s Senior Civilian Representative in Afghanistan in 2010. He also served as Political Director in 2012, as the Prime Minister’s Special Representative for Afghanistan and Pakistan in 2011.

Most recently, Mark held the position of Permanent Secretary at the Home Office from February 2013 until April 2017. Mark was educated at the University of St Andrews, where he graduated as a Bachelor of Science. He was later awarded a Masters in Philosophy from the University of Oxford. He is married with one daughter.

National Security Adviser

The National Security Adviser is the Prime Minister’s senior adviser on national security issues.

He is also Secretary to the National Security Council (NSC) and Head of the National Security Secretariat. The National Security Adviser attends all meetings of the NSC and is responsible for the smooth running of the NSC, its sub-committees, and corresponding officials’ groups.

The National Security Adviser is responsible for managing the NSC agenda and for preparing records of its discussions and decisions.

Previous roles in government

  1. Permanent Secretary

    • 2013 to 2017
  2. Director General, Political

    • 2012 to 2013
  3. Special Representative on Afghanistan and Pakistan

    • 2011 to 2013


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