[2] After her bachelor's degree, she worked for the Eastern Caribbean Currency Authority, the precursor of the Central Bank of Barbados, where she was eventually appointed Research Director.
[2] In 1973 she joined the Central Bank,[3] where she held numerous senior and managerial positions and was appointed Governor in 1999.
[3][4] During her tenure leading monetary policy of Barbados, then-Barbadian Prime Minister David Thompson credited the team led by Williams as helping the Barbadian economy emerge relatively unaffected by the financial crises affecting other parts of the globe.
[5] Upon her retirement in 2009, Thompson announced that he had appointed her as the Barbadian Permanent Representative to the United Nations Office and other international organizations in Geneva.
[5] Williams assumed the post on 1 February 2010, and presented her credentials to the UN Office Secretary-General, Sergei Ordzhonikidze, four days later.