Harding-Davis was let go just days before the ABN Amro-backed fund manager was handed over to administrators last week.
He accepted the newly-created job with Australian Ethical Investment (AEI) immediately and will start in January.
Harding-Davis will target fund managers and financial advisers in a push to boost funds under management and improve platform distribution.
"A key component of Paul's role will be to remove any barriers between investors wanting our products and advisers recommending them," AEI chief executive Anne O'Donnell said.
Harding-Davis joined Absolute Capital in September 2005.
Prior to that, he spent two years as general manager of the Anglican Church-owned Glebe Asset Management, which was shut down in 2005 after the Church failed to find a suitable buyer for it.
He worked for Zurich from 1988 to 2002 and is a former board member of the Ethical Investment Association (now the Responsible Investment Association of Australia).
He said investors were increasingly concerned about environmental and social governance and was looking forward to the role.
"There are a lot of general advisers who know they have clients in this space and are keen to talk about it," he said.
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