Troubled personal injury insurer the ACC will have a caretaker boss until at least early next year.
David May will take over from outgoing chief executive Ralph Stewart on December 14, but only in an acting role.
Mr Stewart resigned in June after only eight months in the job over a series of highly publicised privacy breaches, most of them involving confidential client information inadvertently attached to emails.
Mr May, a former chairman of the NZ Superannuation Scheme who was also managing director of Colonial Mutual from 1995-2000, will take the reins until a new appointment is made, ACC chairwoman Paula Rebstock says.
It will be several months before the new chief executive is in place, she says.
Mr May "will provide the leadership required to maintain the progress of ACC as it continues to deal with the outcome of issues that emerged this year in relation to privacy".
Ms Rebstock, who took over as chairwoman of the corporation following the departure of former chairman John Judge, also paid tribute to Mr Stewart.
"He was exceptionally well regarded by staff and has put in place a number of strategic initiatives that will serve the organisation well in the future.
"Under Mr Stewart's guidance the corporation has accepted the challenges it faces and it has taken action on changes required to ensure client information is treated with utmost respect," said Ms Rebstock.
A major privacy breach at the corporation when ACC claimant Bronwyn Pullar was sent details of more than 6000 other clients led to the resignation of former ACC minister Nick Smith, Mr Judge, Mr Stewart and three other board members.