The National Emergencies Trust has appointed Mhairi Sharp as chief executive.
Sharp, who was chief operating officer at the charity, has been interim CEO since the departure of John Herriman in September.
The charity said Sharp led the formation of the NET, which was launched last year to respond to domestic disasters.
Before joining the NET, Sharp was commercial manager at the Jubilee Sailing Trust, which provides sailing opportunities for disabled and disadvantaged people.
The NET opened its first appeal in March in response to the coronavirus pandemic, which raised almost £100m for UK charities.
The trust also said it had welcomed Adil Husseini as assistant director of fundraising and appointed Vijay Jassal as assistant director of policy and strategic partnerships.
Husseini was previously director of fundraising and marketing at the Disasters Emergency Committee, while Jassal was head of fundraising strategy at the NET.
Sharp said: “Activating the coronavirus appeal has been a defining experience for the NET, but we also know this first appeal must not define us.
“The next national emergency will almost certainly be very different – and we need to be ready.”