Mark Sedwill
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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 f
Sedwill, circa 2013
Sedwill (left) meets with US Secretary of State Mike Pompeo in March 2019.
Simon Case
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Simon Case, Baron Case is a British civil servant who served as Cabinet Secretary and Head of the Home Civil Service from September 2020 to December 2024.
Mark Sedwill
…of October 2020, and David Quarrey took over the role of acting NSA. Sedwill was replaced as Cabinet Secretary and Head of the Home Civil Service by Simon Case on 9 September 2020. Sedwill is a senior adviser and supervisory board member of Rothschild & Co, senior adviser and member of McKinsey & Company’s…
Official portrait, 2026