[3] He joined the civil service in 1966, initially working as an executive officer for the Legislative Council, before becoming a clerk.
Although he resigned from the Legislative Assembly in December 1976,[4] he returned to politics and represented West Makira constituency in the National Parliament.
[7] He was again chosen as Leader of the Opposition in late September 1998, replacing Job Dudley Tausinga.
[8] His role as architect of the Solomon Islands' independence from British rule in 1978 buoyed Mamaloni's support, and he served as opposition leader until his death.
[9] He remained Opposition Leader until his death from kidney disease in a Honiara hospital in January 2000.