Question: What American luxury jewelry and specialty retailer did Jean Michel Schlumberger work at?

full_context: Document 1: Tiffany (NJ) Inc. v. eBay Inc.: Tiffany (NJ) Inc. v. eBay Inc. 600 F.3d 93 (2nd Cir. 2010), is a United States Court of Appeals for the Second Circuit case in which plaintiff Tiffany & Co. filed the complaint, first in 2004, alleging that eBay constituted direct and contributory trademark infringement, trademark dilution, and false advertising since it facilitated and advertised counterfeit Tiffany jewelries on its online market. On July 14, 2008, the District Court for S. D. N. Y. decided in favor of eBay on all claims. Tiffany appealed from these decisions to the Second Circuit. The court affirmed the judgment of the district court with respect to the claims of trademark infringement and dilution. The false advertising claim was returned to the district court for further processing, which was then ruled in favor of eBay.
Document 2: Chanel: Chanel S.A. ( ; ] ) is a French, privately held company owned by Alain and Gérard Wertheimer, grandsons of Pierre Wertheimer, who was an early business partner of the "couturière" Gabrielle Bonheur Chanel. Chanel S.A. is a high fashion house that specializes in haute couture and ready-to-wear clothes, luxury goods and fashion accessories. In her youth, Gabrielle Chanel gained the nickname "Coco" from her time as a chanteuse. As a fashion designer, Coco Chanel catered to women’s taste for elegance in dress, with blouses and suits, trousers and dresses, and jewellry (gemstone and bijouterie) of simple design, that replaced the opulent, over-designed, and constrictive clothes and accessories of 19th-century fashion. The Chanel product brands have been personified by fashion models and actresses, including Inès de La Fressange, Catherine Deneuve, Carole Bouquet, Vanessa Paradis, Nicole Kidman, Anna Mouglalis, Audrey Tautou, Keira Knightley and Marilyn Monroe.
Document 3: F. Schumacher &amp; Co.: F. Schumacher & Co. is a privately held company based in New York City and Newark, Delaware, that designs products for the interior design industry in the United States. Established in 1889 by Frederic Schumacher, F. Schumacher & Co. is a fifth generation business and the only supplier of decorative textiles from the 19th century still privately owned and managed by direct descendants of its founder. The company sells fabrics, wall coverings, trimmings, furnishings, and floor coverings under two brands, Schumacher & Patterson, and Flynn & Martin. F. Schumacher & Co. currently maintains 18 showrooms in several countries and sells to the interior design trade.
Document 4: Harry Winston, Inc.: Harry Winston, Inc. is an American luxury jeweler and producer of Swiss timepieces. Named after its founder, the jeweler Harry Winston, the company has its headquarters in New York City.
Document 5: Tiffany &amp; Co.: Tiffany & Company (known colloquially as Tiffany or Tiffany's) is an American luxury jewelry and specialty retailer, headquartered in New York City.
Document 6: Jean Schlumberger (jewelry designer): Jean Michel Schlumberger (June 24, 1907 – August 29, 1987) was a French jewelry designer especially well known for his work at Tiffany & Co.
Document 7: Sterling Jewelers: Sterling Jewelers, Inc. is an American specialty jewelry company headquartered in Akron, Ohio. The company was founded in 1910 by Henry Shaw (the father of Jerry Shaw, the chairman emeritus of Sterling today), from LeRoy's Jewelers in Lorain, Ohio. Sterling Jewelers is a wholly owned subsidiary of UK-based Signet Jewelers Limited (listed on the New York Stock Exchange under the symbol SIG), having been acquired in 1987.
Document 8: John Loring (designer): John Loring, (born November 23, 1939), is design director emeritus of Tiffany & Co., where he was design director from 1979 to 2009. He is the author of numerous books about Tiffany's and art in general and a longtime contributor to "Architectural Digest".
Document 9: Selima Optique: Selima Salaun was raised in Algeria and Tunisia before attending school and becoming an opticienne-lunetière (licensed as optician, optometrist, and optical artisan) in France. After working in Paris for Royale Optique and Alain Mikli, Salaun landed in New York City to manage Mikli’s first New York store. Foregoing the launch of Mikli’s first store in Japan, the first Selima Optique boutique was opened in 1993 on the corner of Wooster and Broome in Soho. The Optique began fulfilling custom orders with a French atelier when a friend (Hubert Kriegel of the Timeless Ride) asked if Selima could make him a “funkier” version of the iconic “Le Corbusier” frame. After Barney’s president bought a few customs, the store asked to carry a full brand collection and, with some wholesale guidance from Barneys, the first official Selima Optique collection was produced and sold through a shop-in-shop at Barneys New York in 1996. Since 1996 the company has expanded with retail locations and wholesale accounts across the world and into different industries as well. In the 2000s there was Selima’s Soho lingerie store “Le Corset,” French-inspired luxury lingerie shopped by New Yorkers and worn by Baby Spice in the Rolling Stone Magazine. And in 2009 there was “Hats by Selima Atelier,” a collection of eclectic hats created with partner Virginie Promeyrat and notably shopped by Madonna. Now, Selima Optique has retail locations in New York, Los Angeles, Dallas, and Paris, France and its collection is wholesaled globally. The brand has collaborated with the likes of Jack Spade and J.Crew, and more recently with NBA MVP Russell Westbrook, style icon Iris Apfel, and New York’s Neue Galerie. Personally, Selima Salaun has helped mentor designers like Darylynn and Coco & Breezy while sitting on the Council of Fashion Designers of America’s board and helping found the Eyewear Designers of the Council of Fashion Designers of America (efCFDA). Popular with celebrities and creatives, Selima’s clients include Anne Hathaway, Lady Gaga, and Ryan Gosling. Client-turned-friend John Turturro credits her as the inspiration for the character played by Sofia Vergara in his film “Fading Gigolo.”
Document 10: Signet Jewelers: Signet Jewelers Ltd. (Ratner Group 1949-1993 then Signet Group plc to September 2008) is the world's largest retailer of diamond jewelry. The company is domiciled in Bermuda and headquartered in Akron, Ohio, and is listed on the New York Stock Exchange. As of 14th march 2016 the company has been delisted from the London Stock Exchange, following reports that less than 1% of their annual trading volume was conducted via the platform. The group operates in the middle market jewelry segment and has number one positions in the U.S., Canada and UK speciality jewelry markets. Certain brands (Jared in the U.S. and H. Samuel/Ernest Jones/Leslie Davis in the UK) operate in the upper middle market. Signet Jewelers owns and operates the companies Zales, Kay Jewelers, and Jared.
Document 11: Fabergé workmaster: A Fabergé workmaster is a craftsman who owned his own workshop and produced jewelry, silver or objets d'art for the House of Fabergé When Carl Fabergé took over the running of the business in 1882, its output increased so rapidly that the two Fabergé brothers could not manage all the workshops themselves. They therefore decided to establish independent workshops. The owners of these were committed to only work for the House of Fabergé that would supply the sketches and models of the objects to be made. Nothing would be accepted by the House unless it had been approved by either Carl or his appointed deputy. The House of Fabergé also employed its own designers. However we also know from the Memoirs of François Birbaum written in 1919 (Birbaum was Head Designer of the House of Fabergé from 1896 to 1917) that Carl also designed himself.
Document 12: Jean Hugo: Jean Hugo (19 November 1894 – 21 June 1984) was a painter, illustrator, theatre designer and author. He was born in Paris and died in his home at the Mas de Fourques, near Lunel, France. Brought up in a lively artistic environment, he began teaching himself drawing and painting and wrote essays and poetry from a very early age. His artistic career spans the 20th century, from his early sketches of the First World War, through the creative ferment of the Parisian interwar years, and up to his death in 1984. He was part of a number of artistic circles that included Jean Cocteau, Raymond Radiguet, Pablo Picasso, Georges Auric, Erik Satie, Blaise Cendrars, Marie-Laure de Noailles, Paul Eluard, Francis Poulenc, Charles Dullin, Louis Jouvet, Colette, Marcel Proust, Jacques Maritain, Max Jacob, Carl Theodor Dreyer, Marie Bell, Louise de Vilmorin, Cecil Beaton and many others.
Document 13: Lord &amp; Taylor: Lord & Taylor is the oldest luxury department store in the United States, headquartered in New York City. It is a subsidiary of the oldest commercial corporation in North America, the Hudson's Bay Company.
Document 14: Barneys New York: Barneys New York is an American chain of luxury department stores founded and headquartered in New York, New York.
Document 15: Nathalie Colin: Nathalie Colin is a French Creative Director born in 1966 in the East of France. In 2006, she was appointed by Swarovski as Creative Director for the Consumer Goods Business division (CGB), in charge of modernizing the brand. She is still currently leading all creative studios, in charge of the international collections of jewelry, watches, accessories, and crystal living. Nowadays, Swarovski Crystal Business has a global reach with approximately 2,680 stores in around 170 countries, more than 26,000 employees, and revenue of about 2.6 billion euros (in 2016).
ground_truth: Tiffany & Company