Mercer has promoted Rebecca Mather to the role of sustainable investment business leader following Alexis Cheang's recent departure.
Cheang's role as the partner responsible for responsible investment has been split in two with Mather taking responsibility for the business's commercial objectives and revenue targets in Australia and New Zealand.
As for the second position, Mercer is in the process of recruiting a client leader to run client relationships and provide advice within the team.
Both roles report to Jo Holden, Mercer's global head of investment research.
Mather first joined Mercer in 2001 and moved to the asset consultant's sustainable investment six years later.
In addition to being responsible for the commercial objectives of the region's sustainable investment team, she will continue to advise her existing clients.
"Investors are under increasing pressure from their stakeholders to ensure that environmental, social, and governance risks and opportunities are effectively incorporated while meeting fiduciary obligations and managing growing scrutiny from regulators as well as the public," said Mather.
"At the same time, the issues that investors must consider have also proliferated. Where climate change was once front and center, the stage is now shared with other ESG concerns such as biodiversity, modern slavery and diversity, equity, and inclusion, just to name a few."
Mercer said its Pacific sustainability business last year saw record growth, with significant increases in new clients advised on sustainable investment and low carbon transition and new projects providing implementable advice in sustainable investing.
Looking forward, the recent merger of BT Super into Mercer Super brings further growth potential with an increase in sustainable investment assets under management.
Mercer has committed more than US$80 billion of diversified funds to net-zero targets and implemented US$30 billion in dedicated sustainable investment solutions across 13 products.
Mercer's global head of investment research, Jo Holden, said for decades, Mercer has broken new ground in sustainable investment to ensure it solved its clients' needs through innovation and deep global insights.
"In Asia-Pacific alone, last year, we doubled the size of our sustainability investment team, and we'll continue to invest in top talent."