Kyla Shawyer, chief executive of the Resource Alliance, has announced plans to step down next year.
Shawyer has led the group, which supports not-for-profit organisations and runs conferences including the annual International Fundraising Congress in the Netherlands, for the past four years.
In a message sent to members yesterday, Shawyer said she was ready for "a new set of transformational challenges".
She said she was working with trustees to determine the right time to step aside and to create a transition plan "to ensure the organisation and the community will continue to thrive under new leadership".
She said: "I am grateful for the opportunity to have served the Resource Alliance as chief executive through this period of its unique history and evolution, and to have played a role in laying the foundation for the future vision and transformation of the organisation.
"As the Resource Alliance builds on this foundation and moves into its next phase, I too am ready for a new set of transformational challenges focusing on the inspirational and collaborative work that fuels me as a change agent (and professional and leader and mum and wife and friend and human being – the multiple roles that we all play)."
She said that after this year’s IFC, which took place last month, she decided it was the right time to leave.
"I am beginning a transition period (through January 2019) focusing on the strategic work necessary to ensure a smooth handover," she said.
She did not say what her plans for the future were, but said she looked forward to continuing her journey of supporting social change "in various capacities, as a vibrant and active part of the global fellowship of changemakers".
In a subsequent message, Bill Toliver, chair of the Resource Alliance, said Shawyer would be stepping away from many aspects of her day-to-day operational role to focus on ensuring a smooth transition.
He said those working for the organisation "cannot overstate our appreciation" for the vital role Shawyer had played as chief executive, and credited her with developing the organisation’s manifesto, which was launched in 2015.
"She is a leader, a colleague and a friend to all of us," he said.
"As we respect her hunger for new challenges, we take comfort in the fact that she will always be an engaged contributor to our global community."
He said the process for recruiting new leadership would be announced in the coming days.