Caroline Diehl, founding chief executive of the Media Trust, has announced she will step down early next year after 23 years.
Diehl told Third Sector she expected her departure from her role at the charity, which helps other charities to communicate with the media, would take place at the end of February.
She will remain involved with the charity as a patron and will become the executive chair of the charity’s television channel, the Community Channel, as it makes its transition to a cooperatively owned body.
"I’m very excited about the move and think it’s very positive for the charity at this point in its history," said Diehl, who is 60 years old.
"Like a lot of charities, we relied on government funding until a few years ago and we’ve had to find other sources of income, but now the charity is in a really strong position.
"There may be a tear in my eye when the day comes in February, but I’m aware that, as I'm a founder, there comes a point where I need to step aside and allow the charity to go out into the world, rather like a child.
"It’s also a really good time for me personally to start a new chapter."
Diehl said she would not rule out accepting a chief executive position at another charity, but added that she had no firm plans about taking on a new role.
She said: "I am very proud of what we have achieved at Media Trust because I passionately believe in helping all charities of all sizes to have an effective voice and be able to demonstrate how they are affecting communities and people."
She said she was particularly proud of the charity’s work with smaller charities and promoting the voice of beneficiaries in supporting the charities that supported them, which she said was the key to improving public trust in charities.
Richard Eyre, chair of the Media Trust, said: "Caroline has unequivocally demonstrated the important role the media industry can play in helping charities and communities to find their voice.
"It is because of her passion, vision and commitment that so many charities have been successful in sharing their stories and raising the profile of their work.
"Caroline has built a remarkable organisation and we will continue to build on her legacy."
The charity said it had begun the process of recruiting Diehl’s successor.