Scientist Dame Mary Archer is to mark the 21st anniversary of Alzheimer's Research UK by opening the charity's new head office in Cambridgeshire.
Dr Archer will join trustees at the official opening of the new site at Granta Park in Great Abington on April 30.
Dr Archer, who lives in Grantchester, Cambridge, is a former chairman of Cambridge University Hospitals NHS Foundation Trust.
She helped launch Alzheimer's Research UK, then known as Alzheimer's Research Trust, in 1993.
The charity is currently supporting dementia research projects worth almost #21 million at universities across the UK.
It relocated from its former offices in Great Shelford last year.
Dr Archer said: "It's a pleasure to be supporting Alzheimer's Research UK once again.
"The charity has changed incredibly since I was first introduced to it and I am looking forward to hearing more about the organisation's recent successes and plans for the future as it marks its 21st year.
"Dementia is a truly devastating condition which is affecting more and more individuals and families.
"Alzheimer's Research UK is dedicated to finding the answers to our greatest health challenge and it is inspiring to know that so much work to make that happen is taking place in Cambridge."