In 2003 Derek Weir was Managing Director, Corporate & Commercial Banking, The Royal Bank of Scotland  and a member of the Board of the Scottish North American Business Council.
In 2006, Derek Weir resigned from the Royal Bank of Scotland and joined rival bank Barclays.  
- ^ The Royal Bank of Scotland Group, Press Release, http://www.rbs.com/media03.asp?id=MEDIA_CENTRE/PRESS_RELEASES/2003/JANUARY/31_HARVEY_NICHOLS
- ^ The Scotsman, 6 April 2007, Sharon Ward, 'Ken Barclay Says RBS Is Up To Challenge On Corporate Competition', http://business.scotsman.com/topics.cfm?tid=837&id=529612007
- ^ The Scotsman, 24 December 2006, Douglas Friedli, 'RBS reeling as high-flier Weir resigns', http://business.scotsman.com/topics.cfm?tid=837&id=1908062006