Siosi Cocker Mafi is a Tongan economist.
She was Governor of the National Reserve Bank of Tonga from May 2003 to July 2013,[1] the first women to serve in the post.
Mafi started working for the central during 1993.
Sione Ngongo Kioa took over as central bank governor from Siosi Mafi on 21 August 2013, when her second 5-year term expired.
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