Question: What 'Big Three' strategy consulting firm hired the first woman business-strategy consultant, Sandra Ohrn Moose, and was ranked third in "Fortune's 100 Best companies to Work for"?

Context paragraphs:
Working Mother: Working Mother magazine is a national magazine for career-committed mothers.  WorkingMother.com (www.workingmother.com) gives working mothers home and work advice, solutions, and ideas.  2010 marked the 25th anniversary of Working Mother’s signature research initiative, Working Mother 100 Best Companies and almost a decade of Best Companies for Multicultural Women.  The 2014 Working Mother 100 Best Companies for Working Mothers were announced September 16, 2014.  The launching editor of the magazine is Vivian Cadden.

Kaiser Associates: Kaiser Associates is a boutique strategy consulting firm based in Washington DC and London, with offices in Sao Paulo, Cape Town, Toronto, Kuala Lumpur, and Seattle .  The firm was founded in 1981 as a spin-off from Strategic Planning Associates (now Oliver Wyman) by Michael Kaiser, currently President of the John F. Kennedy Center for the Performing Arts in Washington DC.  The firm is noted for its benchmarking, competitive analysis, voice of customer, commercial diligence work supporting investment decisions, and other externally driven strategic development work, developed in the 1980s through extensive work with IBM and General Motors and codified in a number of books including "Developing Industry Strategies: A Practical Guide of Industry Analysis" (1983) and "Understanding the Competition: A Practical Guide of Competitive Analysis" (1981), and "Beating the Competition: A Practical Guide to Benchmarking".  The firm's stated mission is focused on fact-driven consulting to drive value creation.  Kaiser is most frequently defined by its fact-based approach , through which it helps clients incorporate externally driven analysis into its decision making.

Boston Consulting Group: The Boston Consulting Group (BCG) is an American worldwide management consulting firm with 85 offices in 48 countries.  The firm advises clients in the private, public, and not-for-profit sectors around the world, including more than two-thirds of the Fortune 500 and is one of the 'Big Three' strategy consulting firms (MBB).  Considered one of the most prestigious management consulting firms in a branche-internal survey, BCG was ranked third in "Fortune"'s "100 Best Companies to Work For" in 2017.

Greenwich Strategy: Greenwich Strategy, LLC is a small management strategy consulting firm that works for private equity investment funds and operating companies.  The firm is based in based in Providence, RI.  The company’s main address is: 123 Dyer Street, Providence, RI 02903.  Phone: 401 621 0500.

Big Three (credit rating agencies): The Big Three credit rating agencies are Standard & Poor's (S&P), Moody's, and Fitch Group.  S&P and Moody's are based in the US, while Fitch is dual-headquartered in New York City and London, and is controlled by Hearst.  As of 2013 they hold a collective global market share of "roughly 95 percent" with Moody's and Standard & Poor's having approximately 40% each, and Fitch around 15%.  The financial services firm Morningstar, Inc. and its ratings subsidiary Morningstar Credit Ratings has grown its market share, with some publications speculating the firm could transform the 'Big Three' into the 'Big Four' rating agencies.

Alston &amp; Bird: Alston & Bird LLP is an international global law firm with over 800 lawyers in 11 offices throughout the United States, Europe, and Asia.  The firm provides a full range of legal services to domestic and international clients who conduct business worldwide.  Alston & Bird advises major companies including Amazon.com Inc., The Coca-Cola Company, Microsoft Corporation, Bank of America Corporation, Starbucks, Toyota, Dell Inc., UPS, and Nokia Corporation.  For the past 18 years, FORTUNE has ranked Alston & Bird in the "The 100 Best Companies to Work For" list among other FORTUNE500 companies.  Core practices include intellectual property, complex litigation, corporate and tax, with national industry focuses in energy and sustainability, health care, financial services and public policy.

Oliver Wyman: Oliver Wyman is an international management consulting firm with a large focus on banking and financial services.  Founded in 1984, the firm adopted its current form in May 2007, when Mercer Oliver Wyman joined with Mercer Management Consulting and Mercer Delta to become one firm named Oliver Wyman.  As of fiscal year 2016, it was the fourth biggest management consulting firm in the world in terms of revenue, ranking just below the Big Three.  It is part of the Oliver Wyman Group, a business unit of Marsh & McLennan.

NewVantage Partners: NewVantage Partners LLC is a management consulting firm founded in 2001 to advise Fortune 1000 businesses on information management and strategy.  The firm is a leader in Big Data strategy consulting and executive thought-leadership.

Sandra Ohrn Moose: Sandra Ohrn Moose is a senior advisor at the Boston Consulting Group, where she was the first woman hired as a business-strategy consultant.

SparkOptimus: SparkOptimus is a Management consulting firm with a focus on digital strategy and is situated in Amsterdam, the Netherlands.  SparkOptimus provides digital strategy consulting services that help companies to achieve new technology driven growth.  The company currently has helped various companies worldwide from different industries.  Examples of customers include Heineken, AkzoNobel, and Jacobs Douwe Egberts.

Supporting paragraphs: Sandra Ohrn Moose Boston Consulting Group
Answer: Boston Consulting Group