AMP New Zealand chief executive Blair Vernon will serve as acting chief executive at AMP Australia following the departure of Alex Wade.
AMP Australia has begun the search for a permanent replacement.
"We have a strong team in AMP Australia, who have been transforming the business, managing the successful separation of AMP Life, reshaping advice and increasing our focus on clients," said AMP chief executive Francesco De Ferrari.
"I'm pleased we are able to call on an experienced executive in Blair Vernon to lead this team and continue to drive our strategy forward."
Vernon has been with AMP for nearly 11 years, the last year as chief executive. He was previously the GM of strategy and marketing at Bank of New Zealand.