Question: What worldwide management consulting firm had someone on their board who was the co-founder of the Indian School of Business?

Context paragraphs:
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.

McKinsey &amp; Company: McKinsey & Company is a worldwide management consulting firm.  It conducts qualitative and quantitative analysis in order to evaluate management decisions across the public and private sectors.  According to "The New York Times", it is considered the most prestigious management consultancy in the world.  McKinsey publishes the "McKinsey Quarterly" since 1964, funds the McKinsey Global Institute research organization, publishes reports on management topics, and has authored many influential books on management.  Its practices of confidentiality, influence on business practices, and corporate culture have experienced a polarizing reception.

Rajat Gupta: Rajat Kumar Gupta (] ; born 2 December 1948) is an American businessman and philanthropist who served a two-year term in U.S. federal prison for insider trading.  He was the first foreign-born Managing Director (chief executive) of management consultancy firm McKinsey & Company from 1994 to 2003.  He was also a board member of corporations including Goldman Sachs, Procter & Gamble, and American Airlines, as well as an advisor to non-profits such as the Bill & Melinda Gates Foundation and The Global Fund to Fight AIDS, Tuberculosis and Malaria.  Additionally, he is the co-founder of the Indian School of Business, American India Foundation, New Silk Route and Scandent Solutions.

Anil Kumar: Anil Kumar (born 1958) was a senior partner and director at management consulting firm McKinsey & Company, where he co-founded McKinsey's offices in Silicon Valley and India and created its Internet practice (representing a quarter of McKinsey's business at the time) among others.  Kumar is additionally the co-founder of the Indian School of Business with Rajat Gupta and the creator of two different kinds of outsourcing.  He graduated from IIT Bombay in India, Imperial College in the UK, and The Wharton School in the US.

Arthur D. Little: Arthur D. Little is an international management consulting firm originally headquartered in Boston, Massachusetts, United States, and formally incorporated by that name in 1909 by Arthur Dehon Little, an MIT chemist who had discovered acetate.  Arthur D. Little pioneered the concept of contracted professional services.  The company played key roles in the development of business strategy, operations research, the word processor, the first synthetic penicillin, LexisNexis, SABRE and NASDAQ.  Today the company is a multi-national management consulting firm operating as a partnership.

Public sector consulting: Public sector consulting in the US usually refers to the branch of management consulting that works with local and federal governments as well as government agencies.  Several major management consulting firms (e.g.: McKinsey, BCG, Booz&Co, Monitor) do public sector engagements as part of their overall business.  The biggest public sector consulting firm in the UK is PA Consulting Group.

Katzenbach Partners: Katzenbach Partners was a small American management consulting firm.  In 2009 it became a part of the global management consulting firm Booz & Company.

NouvEON: NouvEON (officially NouvEON Technology Partners) is an employee-owned Management Consulting and Information Technology Consulting firm.  NouvEON offers strategic- and project-based management consulting services to improve business performance for their clients.  Headquartered in Charlotte, North Carolina, NouvEON also has offices in Raleigh, North Carolina and professional consultants in Philadelphia, Pennsylvania; Baltimore, Maryland; Minneapolis, Minnesota; and Houston, TX.

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.

Diamond Management &amp; Technology Consultants: Diamond Management & Technology Consultants (casually referred to as Diamond) was an independent management consulting firm founded in 1994, headquartered in Chicago, IL with satellite offices in Hartford, CT, New York City, Washington DC, London, and Mumbai.  It was acquired by the British firm, PwC in 2010.  Diamond was a smaller player among companies such as Mercer Management Consulting, Deloitte Consulting, and Accenture.  The industry segments under which Diamond operated include consumer packaged goods, financial services, and health-care, among numerous others.

Supporting paragraphs: Rajat Gupta McKinsey &amp; Company
Answer: McKinsey & Company