Hilary Browne-Wilkinson, founder and director of the Institute for Philanthropy, is retiring after five years at the helm.
She established the institute five years ago to "develop a greater understanding of philanthropy and its place in modern society".
Browne-Wilkinson trained as a pianist in her native Australia before coming to England and studying law at the University of London.
In 1997 she accepted an invitation from the Prince of Wales to become chair of the Prince of Wales Institute of Architecture and spent two years restructuring it.
She specialised in advising charitable organisations on problems with lottery grants, tax and employment law. She created the institute in 2000.
A new director is now being sought.