High Quality Content by WIKIPEDIA articles! David Einhorn (born November 20, 1968) is an American hedge fund manager, he is the Founder and President of Greenlight Capital, a "long-short value-oriented hedge fund", which he began with in 1996 with around $900,000. Greenlight has historically generated greater than a twenty-two percent annualized net return for partners and investors. Einhorn is the Chairman of Greenlight Capital RE, Ltd, a Cayman Islands-based reinsurance company and one of its major shareholders.