Angela Nash and Chris Gudgeon will add depth and further skills to the boards, says chair.
Sir Lockwood will take up the new role on August 1, 2023.
Mark Binns and Adrian Littlewood appointed as directors as Patrick Strange retires.
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Sarah McHardy worked in a variety of senior roles at Genesis Energy and Vector.
Minister Ayesha Verrall has appointed Nicole Anderson, Phil Taylor and Kiriwaitingi Rei-Russell to the Scion board for a three-year term.
Graham Stuart will be replaced by Susan Paterson after five years at telematics company.
Carolyn Young was most recently the chief executive of Special Olympics New Zealand.
Mark Phillips started with Southern Cross Healthcare on Monday June 12.
The listed retailer has appointed Chris Kinraid as the new group chief executive.