Gus O'Donnell Baron O'Donnell
 Augustine Thomas O'Donnell Baron O'Donnell GCB (born 1 October 1952) is a former British senior civil servant and economist who between 2005 and 2011 (under three Prime Ministers) served as the Cabinet Secretary the highest official in the British Civil Service.O'Donnell announced after the 2010 General Election that he would step down within that Parliament and did so at the end of the year 2011.