trustee

US /ˌtrʌsˈtiː/
UK /ˌtrʌsˈtiː/
"trustee" picture
1.

an individual person or member of a board given control or powers of administration of property in trust with a legal obligation to administer it solely for the purposes specified.

:
The university appointed a new trustee to oversee its endowment.
As a trustee, she is responsible for managing the family's assets.