The vice-chair of the Charity Finance Directors' Group, Helen Verney, is to join Jewish Care at the end of August.
Verney will switch from the MS Society, where she has been director of finance and IT since July 2001.
She will fill the same role at Jewish Care, the largest social care charity for the Jewish community in the UK, which runs 70 centres and specialist services in London and the south east.
Verney said: "I can't wait to help Jewish Care deliver its ambitious social care strategy."
The 34-year-old began her career in the voluntary sector with Crisis, which she joined from the accountants Saffery Champness. Three years later, she became director of finance at the MS Society.
Verney said her rule is that she must save her charity at least the same amount as she earns in salary each year. At the MS Society, the retendering of contracts produced savings of about £120,000 a year.
Jewish Care chief executive Simon Morris said: "Helen's broad range of skills and extensive experience in the charitable sector will make her a tremendous asset to the organisation. We look forward to welcoming her to the team of directors."
- See Focus Finance and Governance, page 21.