Beginning in 1975, she worked in Trust Administration for Barclay's and transferred to several different posts within the Barclay's company until 1977. In 1978, Mason began working as the Magistrate of the Juvenile and Family Court and simultaneously tutoring in family law at UWI. She stopped tutoring in 1983 and continued working as a magistrate. In 1988, Mason completed the
Royal Institute of Public Administration in
London's course on Judicial Administration. In 2000, Mason completed studies on Alternative Dispute Resolution at the
University of Windsor in
Windsor, Ontario, Canada, and then completed a Fellowship with the
Commonwealth Judicial Education Institute in
Halifax, Nova Scotia, in 2001, as well as a course in Advanced Dispute Resolution at UWI. and the following year was the first Barbadian appointed to membership in the
Commonwealth Secretariat Arbitral Tribunal (CSAT). The Tribunal operates among members of the
Commonwealth of Nations to resolve issues concerning contract disputes. == Governor-General of Barbados ==