Photographs: Casper Christoffersen/Reuters.
Time magazine lists 100 'people who inspire us, entertain us, challenge us and change our world'. Meet 13 businesspeople who make it to the top 100 list.
Elinor Ostrom
Elinor Ostrom is an American political economist. She was awarded the 2009 Nobel Memorial Prize in Economic Sciences, which she shared with Oliver E Williamson, for her analysis of economic governance.
She was the first and the only woman to win the prize in this category. Her work is associated with the new institutional economics and the resurgence of political economy.
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World's most influential businesspeople
Photographs: Phil McCarten/Reuters.
Marc Andreessen
Marc Andreessen is an American entrepreneur, investor, software engineer, and multi-millionaire. He is known as the co-author of Mosaic, the first widely-used web browser, and co-founder of Netscape Communications Corporation.
He founded and later sold the software company Opsware to Hewlett-Packard. He is also a co-founder of Ning, a company which provides a platform for social-networking websites. He is one of the directors of Facebook, eBay, and HP.
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World's most influential businesspeople
Photographs: Courtesy, MIT.
Andrew Lo
Andrew Lo is a Professor of Finance at the MIT Sloan School of Management. A leading authority on hedge funds and financial engineering, he proposed the Adaptive market hypothesis.
He is the author of several academic articles in Finance and Financial economics. He is the director of MIT's Laboratory for Financial Engineering, a research associate of the National Bureau of Economic Research, a member of the NASD's Economic Advisory Board, and founder and chief scientific officer of AlphaSimplex Group, LLC.
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World's most influential businesspeople
Ray Dalio
Ray Dalio is an American businessman and founder of Bridgewater Associates.
The son of a jazz musician, Dalio began investing at age 12 when he bought shares of Northeast Airlines for $300 and tripled his investment after the airline merged with another company.
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World's most influential businesspeople
Photographs: Reuters.
Warren Buffett
Warren Edward Buffett is an American business tycoon, investor, and philanthropist. One of the world's most successful investors, he is the chairman and CEO of Berkshire Hathaway. He is the world's third richest person in the world as of 2011.
Buffett is also a notable philanthropist, having pledged to give away 99 per cent of his fortune to philanthropic causes.
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World's most influential businesspeople
Photographs: Courtesy, Wal-Mart Stores.
Alice Walton
Daughter of Wal-Mart founder Sam Walton and Helen Walton, Alice Walton is an American heiress to the Wal-Mart fortune.
In September 2011, her estimated net worth was $20.9 billion, making her the tenth richest American.
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World's most influential businesspeople
Photographs: Christian Hartmann/Reuters.
Sheryl Sandberg
Sheryl Kara Sandberg is an American businesswoman who has served as the chief operating officer of Facebook since 2008.
Prior to Facebook, Sandberg was vice president of global online sales and operations at Google. She also was involved in launching Google's philanthropic arm Google.org.
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World's most influential businesspeople
Photographs: Courtesy, Spanx.
Sara Blakely
Sara Blakely founded Spanx, a multi-million dollar undergarment company. She is the world's youngest self-made female billionaire. She graduated from Florida State University, with a degree in communications.
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World's most influential businesspeople
Photographs: Robert Galbraith/Reuters.
Tim Cook
Tim Cook is the CEO of Apple. Cook joined Apple in March 1998 as SVP of Worldwide Operations and also served as EVP of Worldwide Sales and Operations and was COO until he was named the CEO of Apple on August 24, 2011, succeeding Steve Jobs, who died on October 5, 2011, from pancreatic cancer.
Cook had previously served as acting CEO of Apple after Jobs began a medical leave in January 2011.
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World's most influential businesspeople
Photographs: Jon Iwata-IBM/Handout/Reuters.
Virginia Rometty
Virginia Marie 'Ginni' Rometty is the president and CEO of IBM. She is the first woman to head IBM.
Prior to becoming president and CEO in January 2012, she held the position of senior vice president and group executive for sales, marketing, and strategy at IBM.
She has been named to Fortune magazine's '50 Most Powerful Women in Business' for seven consecutive years.
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World's most influential businesspeople
Photographs: Larry Downing/Reuters.
Christine Lagarde
Christine Lagarde is a French lawyer and the managing director of the International Monetary Fund since July 5, 2011.
She has held various ministerial posts in the French government.
Lagarde was the first woman ever to become minister of Economic Affairs of a G8 economy, and is the first woman to ever head the IMF.
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World's most influential businesspeople
Photographs: Kai Pfaffenbach/Reuters.
Mario Draghi
Mario Draghi is an Italian banker and economist and President of the European Central Bank. He was previously the governor of the Bank of Italy from January 2006 until October 2011.
Draghi is a trustee at the Institute for Advanced Study in Princeton, New Jersey and also at the Brookings Institution, in Washington, D.C.
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World's most influential businesspeople
Photographs: Jacquelyn Martin/Reuters.
Maria Das Gracas Silva Foster
Maria Das Gracas Silva Foster serves as Director for Gas & Energy and is a Member of the Executive Board of Petrobras Distribuidora.
Foster serves as Director of Gas & Energy at Petroleo Brasileiro. She was Chief Gas and Energy Officer of Petroleo Brasileiro since September 21, 2007.
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