Angela Nash and Chris Gudgeon will add depth and further skills to the boards, says chair.
Nick Russ brings more than two decades of regulatory experience spanning three countries.
Youngman has built deep expertise in global funds management, corporate strategy, and international financial services.
Lisa Tai’s appointment follows the departure of long-serving CEO Wayne Howett.
Catherine Shipton has acted on most of the country’s public-private partnerships to date.
Adam Reid will join as managing director and head of resources in Australia.
Debbie Eyre will take up the COO role in February.
Mike Siermans has been the organisation’s interim CEO since September last year.
Alice Mew joins Craigs from the NZ Superannuation Fund, where she most recently served as director, external investments and partnerships.
Willie Wiese leaves Alliance after eight years, including almost three years as chief executive.