Conversation so far:
What is a Goodwill ambassador?
A goodwill ambassador is a person who advocates for a specific cause (e.g. a country or an organisation) on the basis of their notability
What did Orson Welles do?
The mission of the OCIAA was cultural diplomacy, promoting hemispheric solidarity and countering the growing influence of the Axis powers in Latin America

Question: Was he good at it?
Self-contained rewrite: Was Orson Welles good at being a goodwill ambassador?