Sir Gus O'Donnell is a former Cabinet Secretary, head of the Civil Service, and permanent secretary at the Cabinet Office. He served in this position from 2005 until he retired at the end of 2011. He has been described as 'probably Britain's most influential cabinet secretary since the effortlessly grand Lord Butler retired in 1998'. 
- Non-executive director and strategic adviser, Brookfield Asset Management
- Strategic adviser to the chief Eexecutive of Toronto Dominion Bank
- Chairman, Frontier Economics
- Senior fellow, Civil Service College, Singapore
- Fellow, Institute for Government
- Chair, Commission on Wellbeing, Legatum Institute
- Nicholas Watt, Patrick Wintour and Dan Sabbagh, Gordon Brown phone-hacking inquiry halted by civil service, guardian.co.uk, 10 April 2011.
- Sir Gus O'Donnell, civilservice.gov.uk, accessed 11 April 2011.
- Martin Kettle, Farewell, Sir Gus O'Donnell, but you got it wrong on government, 22 December 2011, acc 31 January 2012
- House of Lords Minute of Proceedings, 12 January 2012.
- Lord O'Donnell Parliament.UK, accessed 22 December 2014