Question: Which famous politician was drawn by portrait artist Ellen Semple Barry?

Context paragraphs:
Ron Wagner: Ron J. Wagner is an American comics artist who has drawn for titles such as "G.I. Joe: A Real American Hero", "The Punisher", "", and "".  He is also an animation storyboard artist, games designer, and portrait artist.  He attended the Joe Kubert School of Cartoon and Graphic Art, in a class which also included Lee Weeks, Andy Kubert, and Adam Kubert.  Wagner's earliest work in professional comics, while in his third and final year at the Kubert School, was drawing backgrounds for Stan Woch in World's Finest Comics.

Ellen Semple Barry: Ellen (Semple) Barry (October 4, 1899 – June 12, 1995) was an American portrait artist whose subjects included Dean Acheson, William S. Paley, Vincent Astor, W. Averell Harriman and Pablo Picasso.  Some of her portraits are hung in the National Portrait Gallery.  She was married to the playwright Philip Barry.

Johanna Spinks: Johanna Spinks is a British-born, Los Angeles-based oil portrait artist whose work hangs in many museums, galleries, and private collections.  Spinks is primarily a portrait artist of heirloom, family, corporate, religious, and bridal portraits, but also a landscape and still life painter.

Maria Röhl: Maria Christina Röhl (26 July 1801 – 5 July 1875) was a Swedish portrait artist.  She made portraits of a large number of the best known people in Sweden in the first half of the 19th century.  Her paintings are exhibited at the national museum Nationalmuseum in Stockholm.  The Swedish Royal library has a collection of 1800 portraits by her.  She was a member of the Royal Swedish Academy of Arts (1843) and an official portrait artist of the royal court.

Marshall Bouldin III: Marshall Bouldin III (September 6, 1923 – November 12, 2012) was an American portrait artist from the U.S. state of Mississippi.  Examples of his Oil paintings are currently held in more than 400 private and public art collections throughout the United States. " The New York Times" once praised Bouldin as "the South's foremost portrait painter."  Bouldin became the first painter to be inducted into the National Portrait Artist Hall of Fame of the Portrait Society of America.

W. Averell Harriman: William Averell Harriman (November 15, 1891July 26, 1986) was an American Democratic politician, businessman, and diplomat.  The son of railroad baron E. H. Harriman, he served as Secretary of Commerce under President Harry S. Truman and later as the 48th Governor of New York.  He was a candidate for the Democratic presidential nomination in 1952 and 1956, as well as a core member of the group of foreign policy elders known as "The Wise Men".

Ellen Frank Illumination Arts Foundation: Ellen Frank Illumination Arts Foundation is a non-profit organization with the stated goal of enabling the revitalization of the art of illumination.  Specifically, the organization hopes to enhance understanding of the art and history of illumination among artists and the public and to enable the creation of new work in this historic genre.  The organization pursues this goal by varied means, the most notable being its utilization of a renaissance style atelier to produce its labor-intensive art works.  Under the tutelage of artist Ellen Frank, the Atelier brings together students, artists, scholars, curators, and librarians from all over the world to work on its projects.

Reginald Gray (artist): Reginald Gray (1930 – 29 March 2013) was an Irish portrait artist.  He studied at The National College of Art (1953) and then moved to London, becoming part of the School of London led by Francis Bacon, Lucian Freud and Frank Auerbach.  In 1960, he painted a portrait of Bacon which now hangs in the permanent collection of the National Portrait Gallery in London.  He subsequently painted portraits from life of writers, musicians and artists such as Samuel Beckett, Harold Pinter, Brendan Behan, Garech Browne, Derry O'Sullivan, Alfred Schnittke, Ted Hughes, Rupert Everett and Yves Saint Laurent.  In 1993 Gray had a retrospective exhibition at UNESCO Paris and in 2006, his portrait "The White Blouse" won the Sandro Botticelli Prize in Florence, Italy.

Brenda Bury: Brenda Bury (born 1932) is an English professional portrait artist based in Toronto.  She has painted members of the British Royal Family, the aristocracy, and politicians in the British and Canadian governments.  She has painted Queen Elizabeth II, Margaret Thatcher and John Diefenbaker.  Her portrait of Kenneth Tynan is in the National Portrait Gallery, London.

William Beetham: William Beetham (25 July 1809 – 3 August 1888) was an English-born portrait painter.  He exhibited his paintings at the Royal Academy of Arts London (1834–53) and painted in Hamburg, Copenhagen and at the court of the Tsar in Saint Petersburg.  He emigrated to New Zealand and became a significant figure as a colonist, pastoralist and portrait artist.  He had a society clientele and received commissions to paint portraits of aristocrats and national leaders, including important Māori Rangatira chiefs.  Beetham's paintings are in the permanent collection of the National Portrait Gallery, London and Museum of New Zealand Te Papa Tongarewa in Wellington.  He was a founder and Chair of the New Zealand Academy of Fine Arts in 1882.  Mezzotint prints of Beetham's drawings are in the permanent collection of the Science Museum, London Beetham's paintings and drawings have sold at Bonhams auction house.

Supporting paragraphs: Ellen Semple Barry W. Averell Harriman
Answer: William Averell Harriman