AustralianSuper has appointed Dave Oliver as the new deputy chair after Paul Howes left in July.
Oliver joined the fund's board in July 2007.
"Serving on the board of Australia's largest superannuation fund is a great responsibility because you are the custodian of the retirement savings of millions of Australian workers.
"I look forward to working with Ian Silk, Heather Ridout and the rest of the Australian Super team to continue delivering high returns to members and promoting the benefits of not-for-profit industrial superannuation funds to all Australian workers," Oliver said.
Oliver is the secretary of the Australian Council of Trade Unions and was elected in 2012.
Chair Heather Ridout welcomed the appointed and wished him the best.
Ridout also thanked Howes for his seven years of service.
The fund has hired a former ART executive as its new head of group strategy.
The sovereign wealth fund has revealed six internal hires to support the execution of key strategies.
The fund has announced the departure of a second senior executive in as many months, with its chief member officer to finish up mid-December.
The $89 billion fund has announced a new leadership role within its private markets team.