Question: Greenlight Capital is a hedge fund founded in 1996 by which American investor, hedge fund manager, and philanthropist, born on November 20, 1968?

Context paragraphs:
Greenlight Capital: Greenlight Capital is a hedge fund founded in 1996 by David Einhorn.  Greenlight invests primarily in publicly traded North American corporate debt offerings and equities.  Greenlight is most notable for its short selling of Lehman stock prior to Lehman Brothers' collapse in 2008 and the $11 million fine they received in January 2012 for insider trading in the UK.  Einhorn remains the fund's manager.

David Einhorn (hedge fund manager): David M. Einhorn (born November 20, 1968) is an American investor, hedge fund manager, and philanthropist.  He is the founder and president of Greenlight Capital, a "long-short value-oriented hedge fund."

Ole Andreas Halvorsen: Ole Andreas Halvorsen (born 1961) is a Norwegian-born investor, hedge fund manager, and philanthropist.  He is the CEO and a co-founder of the Connecticut-based hedge fund, Viking Global Investors.  Viking had $16.7 billion under management as of April 2012.  Halvorsen has consistently ranked among the top earning hedge fund managers, placing 11th in Forbes' 2012 rankings and 9th in 2015, according to Institutional Investor's Alpha.

Paul Tudor Jones: Paul Tudor Jones II (born September 28, 1954) is an American investor, hedge fund manager, and philanthropist.  In 1980, he founded his hedge fund, Tudor Investment Corporation, an asset management firm headquartered in Greenwich, Connecticut.  Soon after, he created the Tudor Group, a hedge fund holding company that specializes in fixed income, currencies, equities, and commodities.

Kenneth C. Griffin: Kenneth C. Griffin (born October 15, 1968) is an American investor, hedge fund manager, and philanthropist.  He is the founder and chief executive of the global investment firm Citadel, founded in 1990.  s of March 2015 , Citadel is one of the world's largest alternative investment management firms with an estimated $25 billion in investment capital.  Citadel's group of hedge funds rank among the largest and most successful hedge funds in the world. " Forbes" identified Griffin as one of 2012's highest earning hedge fund managers as well as one of the Forbes 400.

Israel Englander: Israel Englander (born 1948) is an American investor, hedge fund manager, and philanthropist.  In 1989, he founded his hedge fund, Millennium Management, with Ronald Shear.  The fund was started with $35 million and as of February 2017 has $34.77 billion in assets under management.

Bill Ackman: William Albert Ackman (born May 11, 1966) is an American investor, hedge fund manager, and philanthropist.  He is the founder and CEO of Pershing Square Capital Management, a hedge fund management company.  Ackman is considered a contrarian investor but he considers himself an activist investor.  Research published at The University of Oxford characterizes Bill Ackman's activities with Canadian Pacific Railway as paradigmatic of "engaged activism" – which is longer term in nature with correlated benefits to the real economy, as distinct from shorter term "financial activism".

Julian Robertson: Julian Hart Robertson Jr. {'1': ", '2': ", '3': ", '4': "} (born June 25, 1932) is an American investor, hedge fund manager, and philanthropist.  Now retired, Robertson invests directly in other hedge funds, most run by former employees of Robertson's defunct hedge fund company.

J. Ezra Merkin: Jacob Ezra Merkin (born April 19, 1953) is an American investor, hedge fund manager and philanthropist.  He had been a fund manager and capital raiser until 2008 when one of the funds in Gabriel Capital LP, his $5 billion group of hedge funds became insolvent because a large portion of its assets was invested with the convicted Ponzi scheme operator Bernard Madoff.  The fallout from his investment with Madoff has been extensive.  He navigated a series of lawsuits without a finding of fraud or knowledge of the scheme, but agreed to repay any fees earned from the investment in Madoff historically.  He had to resign a series of positions including his role as Non-executive Chairman of GMAC.

Michael Steinhardt: Michael H. Steinhardt (born December 7, 1940) is an American investor, hedge fund manager, and philanthropist.  In 1967, he founded a hedge fund, Steinhardt Partners, that averaged an annualized return for its clients of 24.5% from 1967 to 1978.  In 1995, he closed his fund stating, "I thought there must be something more virtuous, more ennobling to do with one's life than make rich people richer," before making a 2004 comeback to head WisdomTree Investments, a fund with nearly $43 billion USD in assets under management.

Supporting paragraphs: Greenlight Capital David Einhorn (hedge fund manager)
Answer: David M. Einhorn