Stuart Oakley, who had run EM Asia currency trading based in Singapore, left the bank last week after less than two years, the people say. Oakley was a regular pundit on Bloomberg TV and CNBC on Asian currencies. The sources say he has left to join a rival bank.
Oakley began his career at Credit Suisse as an EM FX trader in 1996, before moving to Barclays Capital in 2003.
RBS declined to comment.