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.[1] She continued to serve as Registrar of the Supreme Court until 2005, when she was appointed as Queen's Counsel to the Inner Bar of Barbados.[6] In 2008, Mason was sworn in as an Appeals Judge[2] becoming the first woman to serve on the Barbados Court of Appeals.[6] For three days in 2012, she became the acting Governor-General of Barbados[12] and the following year was the first Barbadian appointed to membership in the Commonwealth Secretariat Arbitral Tribunal (CSAT).