Former Prime Minister Helen Clark's top advisor, Heather Simpson, has returned to advise the new Labour Government.
Ms Simpson has a three-decade working relationship with Ms Clark, working as chief of staff to the Labour Party before spending eight years advising Ms Clark at the UN.
Ms Simpson was given the moniker 'H2' to signify her proximity to H1 - Ms Clark.
Her return is seen as a sign of Labour's move to strengthen its management team behind the scenes.
She is assisting with the staffing of minister's offices and 'reviewing the review' of the campaign.
The Greens have also seen the return of a key advisor.
Andrew Campbell is leaving New Zealand Rugby to take on the role of chief strategist. He was previously chief of staff for the Greens. He was involved during the campaign, before joining the negotiating team.