Question: Who was an  intellectual and diplomat, he held various academic posts and served as a Goodwill Ambassador for UNICEF and President of the World Federalist Movement, Billy Bob Thornton or Peter Ustinov?
Sentence (from "Peter Ustinov"): Sir Peter Ustinov, {'1': ", '2': ", '3': ", '4': "} (born Peter Alexander von Ustinov; or ; 16 April 192128 March 2004) was an English actor, writer, dramatist, filmmaker, theatre and opera director, stage designer, screenwriter, comedian, humorist, newspaper and magazine columnist, radio broadcaster, and television presenter.
Relevant evidence: Yes