Siosiua Halavatau is Deputy Director at the Land Resource Division of the Secretariat of the Pacific Community (SPC) (Suva, Fiji) and holds a PhD in Soil Fertility from the University of Queensland, Australia. His specialization area is in soil fertility and plant nutrition having contributed to the study on diagnosis and correction of nutrition disorders of root crops in the Pacific. Before joining SPC in 2003 he worked as the chief soil scientist for the Ministry of Agriculture in Tonga for almost 20 years. His research works for Tongan agriculture includes soil management, farming systems, and developing and operationalizing participatory technology development in Tonga. In SPC he led an EU project on Development of Sustainable Agriculture In the Pacific (DSAP) from 2003 to 2010 before becoming the Crop Production Advisor which he still holds together with the position of Deputy Director. He currently leads ACIAR research projects on Soil Health in the Pacific Islands.