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?

Context paragraphs:
Mahmoud Kabil: Mahmoud Kabil (Arabic: محمود قابيل‎ ‎ , born May 19, 1946) is an award-winning Egyptian actor and political activist.  He is also the UNICEF Goodwill Ambassador for the Middle East and North Africa.  Kabil served as an officer in the Military of Egypt's Special Forces before becoming a promising actor in Egyptian cinema during the 1970s.  Blacklisted in 1980, Kabil moved to the United States and took a 14-year hiatus from acting.  He made a successful comeback upon his return to Egypt in 1993, and has since starred in more than 50 films and TV series on his way to becoming one of Egypt's most popular actors.  After years of involvement with the United Nations, Kabil was named a UNICEF Goodwill Ambassador in November 2003.

Democratic World Federalists: Democratic World Federalists, a civil society organization based in San Francisco with supporters worldwide, advocates a "democratic federal system of world government" in order to end war and crimes against humanity and to promote “a just world community and the preservation of a livable and healthful global environment” through the development of enforceable world law.  It is affiliated with the Coalition for Democratic World Government, the Community of World Citizens, and the World Federalist Movement.

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.  He was a fixture on television talk shows and lecture circuits for much of his career.  A respected intellectual and diplomat, he held various academic posts and served as a Goodwill Ambassador for UNICEF and President of the World Federalist Movement.

Garry Davis: Sol Gareth "Garry" Davis (July 27, 1921 – July 24, 2013) was an international peace activist who created the World Passport, a fantasy travel document based on his interpretation of Article 13(2), Universal Declaration of Human Rights and on the concept of world citizenship.  Previously Davis had worked as a Broadway stage actor and served as an American bomber pilot in World War II.  He was a devoted World Federalist, although a consistent critic of the World Federalist Movement.

Billy Bob Thornton: William Robert "Billy Bob" Thornton (born August 4, 1955) is an American actor, filmmaker, singer, songwriter, and musician.

James Chau: James Chau (Chinese: 周柳建成 "Zhōuliǔ" "Jiànchéng" ) who was born on 11 December 1977, is a journalist, television presenter, and United Nations Goodwill Ambassador.  He anchors the main evening news on China Central Television, which broadcasts from Beijing to more than 80 countries, and reports live on location worldwide.  As a correspondent, he has covered breaking news on the Asian tsunami and global SARS outbreak, and has interviewed world figures: UN Secretary-General Ban Ki-moon, Nobel Laureate Françoise Barré-Sinoussi, and King Constantine II.  He is one of the few journalists to have interviewed Zimbabwean President Robert Mugabe and mathematics teacher Anand Kumar. , In 2009, he was appointed by the United Nations as China's first UNAIDS Goodwill Ambassador.

World Federalist Movement: The World Federalist Movement (WFM) is a global citizens movement that advocates the establishment of a global federal system of strengthened and democratic global institutions subjected to the principles of subsidiarity, solidarity and democracy.  Famous advocates of world federalism include Albert Einstein, Mahatma Gandhi, Martin Luther King Jr., Rosika Schwimmer, Garry Davis, Emery Reves and Lola Maverick Lloyd.  The organization was created in 1947 by those concerned that the structure of the new United Nations was too similar to the League of Nations which had failed to prevent World War II, both being loosely structured associations of sovereign nation-states, with few autonomous powers.

Peter Luff (campaigner): Peter John Roussel Luff, Director Mass1, Trustee, Mass Extinction Monitoringl Observatory (MEMO), Vice Chair, World Federalist Movement - Institute for Global Policy, Trustee, China Dialogue, formerly CEO Action for a Global Climate Community (2003-2011) Director of the Royal Commonwealth Society (1997–2001); formerly Director and Vice Chair of The European Movement UK, The International European Movement (1986–1995) Funding and Marketing Director of the Social Democratic Party (1981–1987) and Assistant Director of Amnesty International UK (1974–1978)

World Federalist Movement-Canada: The World Federalist Movement — Canada (WFMC) is a member organization of the World Federalist Movement, a global citizens movement dedicated to promoting institutions of world governance.  WFMC has a national headquarters in Ottawa, and active branches in Vancouver, Victoria, and Montreal.

Chrystal (film): Chrystal is an American drama film, which was released to audiences in the United States on April 8, 2005.  The cast included Billy Bob Thornton, Lisa Blount, Harry Lennix, Walton Goggins, and Grace Zabriskie.  Ray McKinnon, in addition to playing the role of "Snake", directed, wrote, and produced the film.  The story is about a woman named Chrystal (Lisa Blount) who has been traumatized both physically and mentally from a car accident that took the life of her son.  Joe (Billy Bob Thornton), Chrystal's husband, has just been released from jail after a 16-year sentence stemming from multiple crimes he committed.

Supporting paragraphs: Billy Bob Thornton Peter Ustinov
Answer: Sir Peter Ustinov