As news of Scott's departure was announced, the finance directors' body unveiled a new brand image to reflect the "central position of finance directors in charities" and their links with other professions.
When Scott joined the CFDG, initially on a part-time basis, from the Charity Commission 11 years ago, it had 300 members. It has now grown to 1,100 charity finance directors managing £10bn of income each year.
"CFDG is poised to enter a new phase of development and, with so many exciting opportunities emerging in the sector, it is an appropriate time for me to move on," said Scott.
"I hope there will still be a role for me at CFDG, but I want to use my knowledge and skills elsewhere in the sector too, working more closely with charities and trustees."
Paul Breckell, chairman of the CFDG, praised Scott's role in establishing the organisation as "the leading body for financial management in the charity sector".
The CFDG's new image, revealed at the organisation's AGM last week, replaces the traditional charging horseman with a more opaque frayed circle.
Events and marketing manager Susanne Kendler said: "We have put our horseman out to grass and will roll out the new branding over the next few months.
We felt the old image didn't really sit in people's minds."
She declined to reveal how much the rebranding - by designers Calverts - cost, but said it was "at the very low end of five figures".
"We are promoting good financial management, so we don't want to be seen to be splashing money around," she added. "But we have grown, so we needed a more modern image."
Drew Corps, creative director at design agency Navig8, said: "Clearly the CFDG was ripe for a new corporate identity, ditching the knight in full charge.
"The new logo, a pink dot, might be the way forward.
I like the idea of a slightly brighter approach."
Shirley Scott, who joined the Charity Finance Directors' Group in 1994, is leaving the organisation in December
The CFDG has 1,100 members, managing £10bn of income each year
At its recent AGM, the CFDG unveiled its new logo, replacing its charging horseman with a frayed circle. It wouldn't say how much the rebrand cost.