Mark Lyall Grant
| Sir Mark Lyall Grant | |
|---|---|
| Mark Lyall Grant speaking at Chatham House in 2011 | |
| United Kingdom National Security Adviser | |
| In office 7 September 2015 – 13 April 2017 | |
| Prime Minister | David Cameron Theresa May | 
| Preceded by | Kim Darroch | 
| Succeeded by | Mark Sedwill | 
| Permanent Representative of the United Kingdom to the United Nations | |
| In office 1 November 2009 – 25 April 2015 | |
| Monarch | Elizabeth II | 
| Prime Minister | Gordon Brown David Cameron | 
| Preceded by | John Sawers | 
| Succeeded by | Matthew Rycroft | 
| Director-General for Political Affairs at the United Kingdom Foreign and Commonwealth Office | |
| In office 2007–2009 | |
| Preceded by | John Sawers | 
| Succeeded by | Geoffrey Adams | 
| Personal details | |
| Born | 29 May 1956 Hammersmith, London, England | 
| Spouse(s) | Sheila, Lady Lyall Grant | 
| Children | 2 | 
| Education | Eton College | 
| Alma mater | University of Cambridge | 
| Website | www | 
Sir Mark Justin Lyall Grant GCMG (born 29 May 1956) is a former senior British diplomat who was previously the United Kingdom's National Security Adviser and Permanent Representative of the United Kingdom to the United Nations.