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Mark Sedwill
National Security Advisor · 2017
Mark Sedwill, National Security Advisor. Mark Philip Sedwill, Baron 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.
Positions
- National Security Advisor2017-04-13–2020-09-16
Biography
Mark Philip Sedwill, Baron 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.
From Wikipedia (CC BY-SA).
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From Senate roll call votes, Wikidata, Wikipedia and Office of Government Ethics records.
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Capitol Receipts, “Mark Sedwill: National Security Advisor,” https://www.capitolreceipts.com/appointee/wQ6769664/mark-sedwill (accessed 2026-10-13).