Connect, which helps people suffering from aphasia, has been funded largely by trusts and foundations, such as the Dunhill Medical Trust, since its inception eight years ago.
But the amount the charity receives from trusts and foundations is likely to decline because the aim of the funding was to help it to establish itself. The long-term aim is to build the charity's corporate donor base.
The first task of the new director of fundraising, who is expected to be in post by August, will be to recruit a corporate fundraiser and a trust and foundation fundraiser.
Phyllis Campbell-McRae, chief executive of Connect, said: "The plan is to make the charity sustainable. We want to get funds from different sources."