Sione is the Secretary General to the Red Cross since 2000. As the Secretary General of Tonga Red Cross Society (TRCS), he has invested substantial endeavors in improving operational capacity as well as effectiveness and efficiency of service delivery in four core programme areas – promotion of Fundamental Principles and humanitarian values, disaster response, disaster preparedness and health and care in the community, all of which are described in Strategy 2010.
He is a Board of Director for Civil Society Forum of Tonga and Treasurer since 2003, and is member of the National Emergency Management Office (NEMO) since 2000 National disaster management at Ministry of Meteorology, Energy, Information, Disaster Management, Environment, Climate Change, Communications, and CERT/E-Government.