Another director Kim Ellis has also indicated his intention to retire at the fund's annual meeting in November.
The fund board has appointed Mary-Jane Daly as chair-elect.
Daly was elected to the board in November 2020.
She is currently chair of the Earthquake Commission and an Independent Director of Kiwibank and Kiwi Property Group Limited. She has a strong background in insurance, banking and finance with experience in a variety of senior roles both in New Zealand and the United Kingdom.