resource person

US /ˈriːsɔːrs ˌpɜːrsn/
UK /ˈriːsɔːrs ˌpɜːrsn/
"resource person" picture
1.

a person who is a source of special knowledge or expertise

:
The workshop invited a renowned scientist as a resource person to speak on climate change.
For any questions regarding the new software, please contact our resource person, Sarah.