When announcing the shadow cabinet, Opposition Leader Patrick Pruaitch said Masiu, 53, has a solid background in community socio-economic development issues and is destined to play a key role in Parliament as Deputy Opposition Leader.
Masiu, who entered Parliament after a by-election in July 2016 and regained his seat in the recent general election, spent his early career as a journalist and broadcaster prior to taking on key advisory roles in government.
He has also served as deputy chairman of the National Broadcasting Corporation, chairman of the Vunamami Farmers' Training Centre and coordinator of the "Katim Na Halivim Pikinini" children's health project.
Pruaitch said the Alliance has a team with the capacity to match the intellectual and leadership qualities of the National Executive Council and stand in readiness as the alternate government.
He said they, as a formidable Shadow Cabinet, will challenge the O'Neill Government on the inept management of the PNG economy and massive levels of corruption and waste.