Question: Who was the last Republican mayor in the city where Ralph Heller was born?

full_context: Document 1: Ralph Helfer: Ralph Helfer (born April 9, 1931 in Chicago, Illinois) is a notable American animal behaviorist, creator of Marine World/Africa USA, and writer of books about animals.
Document 2: William Hale Thompson: William Hale Thompson (May 14, 1869 -- March 19, 1944) was an American politician, mayor of Chicago for three terms, from 1915 to 1923 and again from 1927 to 1931. Known as ``Big Bill ''Thompson, he is the last Republican to have served as mayor of Chicago to date. Historians rank Thompson among the most unethical mayors in American history, mainly for his open alliance with Al Capone. However, others recognize the effectiveness of his political methods and publicity - oriented campaigning, acknowledging him as a`` Political Chameleon'' and an effective political machine. TIME magazine said in 1931, ``chief credit for creating 20th Century Politics Chicago Style ''should go to William Thompson.
Document 3: Ralph Hubbard Norton: Ralph Hubbard Norton (1875–1953), born in Chicago, was an art collector and museum founder. Norton's use of an endowment was innovative and novel at the time he set it up to support the museum he established in perpetuity. He was inducted into the Florida Artist Hall of Fame in 1994.
Document 4: Henry Spira: Henry Spira (19 June 1927 – 12 September 1998) was a Belgian-American animal rights advocate, regarded by some as one of the most effective animal advocates of the 20th century.
Document 5: John L. Behler: John L. Behler (1946 – January 31, 2006) was an American naturalist, herpetologist, author, and activist known for his work in conserving endangered species of turtles, snakes, and other reptiles. He served as curator of herpetology at the Bronx Zoo, part of the Wildlife Conservation Society from 1976 to 2006. He co-chaired the IUCN Tortoise and Freshwater Turtle Specialist Group, and was a founding member of the Turtle Survival Alliance, which co-present the Behler Turtle Conservation Award with the Turtle Conservancy and Turtle Conservation Fund. The Behler Turtle Conservation Award is a major annual award to honor leadership in the field of freshwater turtle and tortoise conservation. The Turtle Conservancy named its captive breeding center, the Behler Chelonian Center, in his honor.
Document 6: Ralph Mark Gilbert: Ralph Mark Gilbert (March 17, 1899, Jacksonville, Florida - August 23, 1956, New York City) was an American civil rights leader and a Baptist minister.
Document 7: Ralph Avery: Ralph Avery (1907–1976) was an American landscape painter and watercolorist based in Rochester, New York. He recorded city streets, churches, trees, iron fences, and the ambiance of Rochester, New York. He also painted in Mexico, the West Indies, Europe, and Northern Africa.
Document 8: Edward Fitzsimmons Dunne: Edward Fitzsimmons Dunne (October 12, 1853 – May 24, 1937) was an American politician who was the 24th Governor of Illinois from 1913 to 1917 and previously served as the 38th mayor of Chicago from April 5, 1905 to 1907. He is to date the last Mayor of Chicago to be elected Governor of Illinois.
Document 9: History of Wrigley Field: In the fall of 1987, Chicago mayor Harold Washington proposed a compromise ordinance to the Chicago City Council which allowed the Cubs to install lights, but limited the number of night games. Washington died a week after the compromise was proposed, but the city eventually approved a compromise in February 1988 under interim mayor Eugene Sawyer. Major League Baseball responded by awarding the Cubs the 1990 All - Star Game.
Document 10: William M. Tweed: William Magear Tweed (April 3, 1823 -- April 12, 1878) -- often erroneously referred to as ``William Marcy Tweed ''(see below), and widely known as`` Boss'' Tweed -- was an American politician most notable for being the ``boss ''of Tammany Hall, the Democratic Party political machine that played a major role in the politics of 19th century New York City and State. At the height of his influence, Tweed was the third - largest landowner in New York City and a director of the Erie Railroad, the Tenth National Bank, and the New - York Printing Company, as well as proprietor of the Metropolitan Hotel.
Document 11: Ralph Greenleaf: Ralph Greenleaf (November 3, 1899 in Monmouth, Illinois – March 15, 1950 in Philadelphia, Pennsylvania) was an American professional pool and carom billiards player, a twenty-time World Pocket Billiards Champion, whose ability and charisma dominated the sport during his heyday.
Document 12: James Curtiss: James Curtiss (also Curtis) (March 29, 1806 – November 2, 1859) was an American politician who twice served as Mayor of Chicago, Illinois (1847–1848 and 1850–1851) for the Democratic Party.
Document 13: Ralph L. Brinster: Ralph Lawrence Brinster is an American geneticist and Richard King Mellon Professor of Reproductive Physiology at the School of Veterinary Medicine, University of Pennsylvania.
Document 14: Detroit: Beginning with its incorporation in 1802, Detroit has had a total of 74 mayors. Detroit's last mayor from the Republican Party was Louis Miriani, who served from 1957 to 1962. In 1973, the city elected its first black mayor, Coleman Young. Despite development efforts, his combative style during his five terms in office was not well received by many suburban residents. Mayor Dennis Archer, a former Michigan Supreme Court Justice, refocused the city's attention on redevelopment with a plan to permit three casinos downtown. By 2008, three major casino resort hotels established operations in the city.
Document 15: University of Chicago: Notable alumni in the field of government and politics include the founder of modern community organizing Saul Alinsky, Obama campaign advisor and top political advisor to President Bill Clinton David Axelrod, Attorney General and federal judge Robert Bork, Attorney General Ramsey Clark, Prohibition agent Eliot Ness, Supreme Court Justice John Paul Stevens, Prime Minister of Canada William Lyon Mackenzie King, 11th Prime Minister of Poland Marek Belka, Governor of the Bank of Japan Masaaki Shirakawa, the first female African-American Senator Carol Moseley Braun, United States Senator from Vermont and 2016 Democratic Presidential Candidate Bernie Sanders, and former World Bank President Paul Wolfowitz.
ground_truth: William Hale Thompson
sub_queries: What is Ralph Helfer's birthplace? Answer: Chicago
who was the last republican mayor in Chicago Answer: William Hale Thompson