Greenlight Capital's founder and president David Einhorn has built his reputation as a stellar short-seller and stock picker for making controversial early calls that ultimately proved correct, but he has battled with companies, regulators and even media outlets along the way. At the 2002 Ira W. Sohn Investment Research Conference, Einhorn detailed his reasons for shorting Allied Capital Corp., charging that the company engaged in improper accounting that inflated the stock. The resulting torrent of investors wanting to sell or short Allied's stock sparked regulators' attention. The SEC ultimately found no wrongdoing, and Einhorn, who argued that the investigation was flawed from the start, was ultimately vindicated…