Question: What was the sobriquet of the woman who hired Joyce Beber?

full_context: Document 1: Berk Communications: Berk Communication and Marketing Group is an American public relations firm. The company is best known for representing D'usse Cognac, Kevin Durant, Robinson Canó, CC Sabathia, Roc Nation Sports, Tao Group, Tidal and Alex Rodriguez. Berk was founded in 1999. Britney Spears hired Berk Communications in 2002 to promote Nyla, Spears' restaurant in Manhattan's Dylan Hotel. In October 2015, MWW, a public relations firm headquartered in New York, acquired a majority stake in Berk. The company operates as an independent subsidiary acquisition and has expanded across the United States and Europe. Ron Berkowitz is the company's President and CEO. In February 2016, Berk signed with The Statler Hotel & Residences as public relations support through the hotel's relaunch. When baseball player Alex Rodriguez announced his retirement in 2016, it was also announced that Berk Communications would continue to work with Rodriguez. Rodriguez first signed with Berk in 2013.
Document 2: Rosser Reeves: Rosser Reeves (10 September 1910 – 24 January 1984) was an American advertising executive and pioneer of television advertising; Reeves generated millions for his clients. The Ted Bates agency, where he rose to chairman, exists today as Bates 141. The AMC program, "Mad Men", uses Reeves as one model for the professional accomplishments of the series' protagonist, Donald Draper (played by Jon Hamm).
Document 3: Mark E. Brown: Mark E. Brown is an American businessman and former CEO of Zen Entertainment and a former vice president of The Howard Hughes Corporation. His company currently has partnership deals with ESPN Radio, Fox Sports Radio, NBCSports.com, Ultimate Fighting Championship, World Wrestling Entertainment, and casinos such as the Treasure Island Hotel and Casino, Hard Rock Hotel. He is also the former Partner and President of R&R Partners, the ad agency which created the "What Happens in Vegas, Stays in Vegas" advertising campaign for the Las Vegas Convention and Visitors Authority. In addition, Brown is founder and director of Service 1st Bank of Nevada, valued in 2010 around $210 million, and previously served as the President of MBC Communications.
Document 4: Think Small: Think Small was one of the most famous ads in the advertising campaign for the Volkswagen Beetle, art directed by Helmut Krone. The copy for Think Small was written by Julian Koenig at the Doyle Dane Bernbach (DDB) agency in 1959. Doyle Dane Bernbach's Volkswagen Beetle campaign was ranked as the best advertising campaign of the twentieth century by "Ad Age", in a survey of North American advertisements. Koenig was followed by many other writers during Krone's art-directorship of the first 100 ads of the campaign, most notably Bob Levenson. The campaign has been considered so successful that it "did much more than boost sales and build a lifetime of brand loyalty [...] The ad, and the work of the ad agency behind it, changed the very nature of advertising—from the way it's created to what you see as a consumer today."
Document 5: Martha Stewart: Martha Helen Stewart (née Kostyra; born August 3, 1941) is an American businesswoman, writer, and television personality. As founder of Martha Stewart Living Omnimedia, she has gained success through a variety of business ventures, encompassing publishing, broadcasting, merchandising, and e-commerce. She has written numerous bestselling books, is the publisher of the "Martha Stewart Living" magazine, and hosted two long-running syndicated television shows, "Martha", which ran from 2005 to 2012, and "Martha Stewart Living", which ran from 1993 to 2005.
Document 6: Joyce Beber: Joyce Beber, born Joyce Sacks, (November 20, 1929 - September 17, 2010) was an advertising executive who co-founded the Beber Silverstein Group and created numerous memorable campaigns for the Helmsley group of hotels. The campaigns successfully promoted Leona Helmsley and her hotel chain; Beber was hired and fired four times by Helmsley.
Document 7: Jerry Della Femina: Jerry Della Femina (born 1936) is an American advertising executive and restaurateur. Starting from a poor Italian background in Brooklyn, he eventually became chairman of Della Femina Travisano & Partners, an agency which he founded with Ron Travisano in the 1960s. Over the next two decades they grew the company into a major advertising house that was billing $250 million per year and had 300 employees and offices in both New York and Los Angeles. Della Femina is known for his larger-than-life personality and colorful language, and was referred to as a "'Madman' of Madison Avenue". In 1970, he wrote a book about the advertising industry, humorously titled, "From Those Wonderful Folks Who Gave You Pearl Harbor: Front-Line Dispatches from the Advertising War". The book became a best-seller, described by "The Guardian" as "one of the defining books about advertising", and eventually inspired the television series "Mad Men".
Document 8: Bernice Fitz-Gibbon: Bernice Bowles "Fitz" Fitz-Gibbon (1894 – February 22, 1982) was an American advertising executive and a pioneer in retail advertising, working at Marshall Field's, Macy's, Gimbels and Wanamaker's. She was inducted into the Advertising Hall of Fame in 1982. She was named #62 on the 100 people of the 20th century by "Advertising Age". She was also honored by Retail Advertising Confederation and the Copywriters Club of New York.
Document 9: Leona Helmsley: Leona Mindy Roberts Helmsley (born Lena Mindy Rosenthal; July 4, 1920 – August 20, 2007) was an American businesswoman. She was known for her flamboyant personality and had a reputation for tyrannical behavior that earned her the sobriquet Queen of Mean. She was promoted by the Beber Silverstein Group and its co-founder Joyce Beber persuaded Helmsley to replace that title with Queen of the Palace Hotel instead.
Document 10: Halston: Roy Halston Frowick (April 23, 1932 – March 26, 1990), known simply as Halston, was an American fashion designer who rose to international fame in the 1970s. His minimalist, clean designs, often made of cashmere or ultrasuede, were popular fashion wear in mid-1970s discotheques and redefined American fashion. An American designer, Halston was well known for creating a style for “American Women”. From his point of view, the “American Woman” was about having a relaxed urban lifestyle. He created a new phenomenon in the 1970s. Halston believed that women can wear the same clothing for the entire day on any occasion.
Document 11: Joan Rivers: Joan Alexandra Molinsky (June 8, 1933 – September 4, 2014), widely known as Joan Rivers, was an American comedian, actress, writer, producer, and television host. She was noted for her often controversial comedic persona—alternatingly self-deprecating or sharply acerbic, especially toward celebrities and politicians.
Document 12: Elisabeth Gürtler: Elisabeth Gürtler-Mauthner (born May 7, 1950) is an Austrian businesswoman. She is managing director of the Hotel Sacher, Vienna's most famous hotel.
Document 13: Paris Hilton: Paris Whitney Hilton (born February 17, 1981) is an American businesswoman, socialite, television and media personality, model, actress, singer, and DJ. She is the great-granddaughter of Conrad Hilton, the founder of Hilton Hotels. Born in New York City and raised there and in Beverly Hills, California, Hilton began her modeling career as a teenager when she signed with New York-based modelling development agency Trump Model Management. Her lifestyle and rumored short-lived relationships made her a feature of entertainment news and tabloid magazines, and Hilton was proclaimed "New York's leading It girl" in 2001. In 2003, a sex tape with Hilton and her then-boyfriend Rick Salomon, later released as "1 Night in Paris", was leaked to the public. Released only three weeks before the premiere of the reality television series "The Simple Life", in which she starred alongside her long-time friend Nicole Richie, the sex tape became a media sensation.
Document 14: Mona von Bismarck: Mona von Bismarck (February 5, 1897 – July 10, 1983), known as Mona Bismarck, was an American socialite, fashion icon, and famed beauty. Her five husbands included Harrison Williams, said to be the richest man in America, and the Graf von Bismarck-Schönhausen, grandson of German Chancellor Otto von Bismarck. Mona was the first American to be named "The Best Dressed Woman in the World" by a panel of top couturiers including Chanel, and was also named to the International Best Dressed List Hall of Fame.
Document 15: Rena Rosenthal: Rena Rosenthal (1880–1966) was a trend-setting American retailer and businesswoman. Known principally for her exclusive Madison Avenue retail shop in New York City, she was an influential arbiter of taste and fashion in the interior decorating world, particularly during the introduction of modernism to North America.
ground_truth: Queen of Mean