Question: Who is the former Sri Lankan- hedge fund manager that was investigated by BJ Kang for insider trading?

full_context: Document 1: Ken Marlin: Ken Marlin is an American investment banker, international strategist, and author of "The Marine Corps Way to Win on Wall Street: 11 Key Principles from Battlefield to Boardroom", available from St. Martin's Press in August 2016. He is the founder and managing partner of Marlin & Associates, an award-winning boutique investment bank and strategy advisor. He is a member of the “Market Data Hall of Fame” and, in 2011, Institutional Investor ("II"), the international publisher, named Ken as one of II’s “Tech 50”, which honored the 50 most “disruptive” figures in the financial technology sector. In 2014, Institutional Investor again, named Marlin to their "Tech 50" as one of the 50 most influential people in the financial technology industry. Again, he was the only investment banker on the list. In 2015 Institutional Investor named Marlin as one of the 35 most influential people in Fintech finance. Marlin also is a member of the Board of Directors and the Executive Committee of the Phoenix House Foundation; a Trustee and Board Member of the Madison Square Boys and Girls Club; a member of the Business Administration Board of Advisors of the University of the People; an active supporter of the Wall Street Warriors Foundation, The Marine Corps Heritage Foundation; the Hurricane Island Outward Bound School; and Outward Bound Peacekeeping. He has been quoted frequently in the media.
Document 2: Marc Rich: Marc Rich (born Marcell David Reich; December 18, 1934 – June 26, 2013) was an international commodities trader, hedge fund manager, financier and businessman. He was best known for founding the commodities company Glencore and for being indicted in the United States on federal charges of tax evasion and making controversial oil deals with Iran during the Iran hostage crisis. He was in Switzerland at the time of the indictment and never returned to the United States. He received a controversial presidential pardon from U.S. President Bill Clinton on January 20, 2001, Clinton's last day in office.
Document 3: Richard Behar: Richard Behar is an American investigative journalist. Since 2012, he has been the Contributing Editor of Investigations for Forbes magazine. From 1982 to 2004, he wrote on the staffs of "Forbes", "Time" and "Fortune". Behar's work has also been featured on BBC, CNN, PBS, FoxNews.com and Fast Company magazine. He coordinates Project Klebnikov, a media alliance to probe the Moscow murder of Forbes editor Paul Klebnikov. He is writing a book about Bernard Madoff. Behar is editor of Mideast Dig.
Document 4: Mehraj Mattoo: Mehraj Mattoo (महराज मट्टू ) is a British investment banker, economist and author; currently a Senior Fellow at Harvard University. He is the Co-founder and CEO of Commonwealth Asset Management. According to the UK and Cayman Islands company records, Commonwealth Asset Management is majority owned by NR Investments, the investment vehicle of the Rothschild Family. Before co-founding Commonwealth, Dr. Mattoo was Global Head of Asset Management at Commerzbank AG, leading one of the largest hedge fund and private equity groups globally (Investhedge 2009; The Billion Dollar Club). Prior to Commerzbank, Dr. Mattoo was the Managing Director of Dresdner Kleinwort Wasserstein, the investment banking arm of Dresdner Bank AG, the second largest bank in Germany. In the mid-1990s, Dr. Mattoo co-founded the first fund derivatives group in the City at BNP Paribas, the largest French/global bank by assets. He is widely credited for pioneering the use of structured products on alternative investments, especially hedge funds, that helped attract institutional assets to the hedge fund industry and contributed to its explosive growth over the following decade. In the early 1990s, Dr. Mattoo established and led the Structured Products business at NatWest Markets, the investment banking arm of Britain's largest bank, National Westminster Bank, now part of RBS Group and led an educational effort aimed at promoting responsible use of derivatives by corporations and institutional investors.
Document 5: Arvind Raghunathan: Arvind Raghunathan (born October 24, 1963) is a Hedge Fund Manager. He is the founder and CEO of Roc Capital Management LP (the largest Hedge Fund launch of 2009). On February 25, 2009, it was announced that Raghunathan and his associates would be leaving Deutsche Bank to set up the independent quant trading hedge fund. It was rumored in late July 2013 that the main fund of Roc Capital Management would be liquidated after losses.
Document 6: Bernard Madoff: Bernard Lawrence "Bernie" Madoff ( ; born April 29, 1938) is an American fraudster and a former stockbroker, investment advisor, and financier. He is the former non-executive chairman of the NASDAQ stock market, and the admitted operator of a Ponzi scheme that is considered the largest financial fraud in U.S. history. Prosecutors estimated the size of the fraud to be $64.8 billion, based on the amounts in the accounts of Madoff's 4,800 clients as of November 30, 2008.
Document 7: Harshad Mehta: Harshad Mehta was an Indian stockbroker, well known for his wealth and for having been charged with numerous financial crimes that took place in 1992. Of the 27 criminal charges brought against him, he was only convicted of four, before his death at age 47 in 2001. It was alleged that Mehta engaged in a massive stock manipulation scheme financed by worthless bank receipts, which his firm brokered in "ready forward" transactions between banks. Mehta was convicted by the Bombay High Court and Supreme Court of India for his part in a financial scandal valued at 4999 Crores which took place on the Bombay Stock Exchange (BSE). The scandal exposed the loopholes in the Indian banking system, Bombay Stock Exchange (BSE) transaction system and SEBI further introduced new rules to cover those loopholes. He was tried for 9 years, until he died in late 2001.
Document 8: Raj Rajaratnam: Raj Rajaratnam (Tamil: ராஜ் ராஜரத்தினம் ; born Rajakumaran Rajaratnam; June 15, 1957) is a Sri Lankan-American former hedge fund manager and billionaire founder of the Galleon Group, a New York-based hedge fund management firm. On October 16, 2009, he was arrested by the FBI for insider trading, which also caused the Galleon Group to fold. He stood trial in "U.S. v Rajaratnam" (09 Cr. 01184) in the United States District Court for the Southern District of New York, and on May 11, 2011 was found guilty on all 14 counts of conspiracy and securities fraud. On October 13, 2011, Rajaratnam was sentenced to 11 years in prison and fined a criminal and civil penalty of over $150 million combined.
Document 9: BJ Kang: BJ Kang is an American Federal Bureau of Investigation special agent known for high-profile investigations of securities fraud. After leading the perp walk of Bernie Madoff in 2008 and Raj Rajaratnam in 2009, Reuters described him as possibly "the most feared man on Wall Street."
Document 10: BBK stock price manipulation incident: During the 2007 presidential election, questions about presidential candidate Lee Myung-bak's relationship with a company called BBK were raised. Kyung Joon Kim is a graduate of Cornell University and have Masters degree from the University of Chicago, and an MBA from the Wharton School of the University of Pennsylvania. Kim worked as an investment banker at Morgan Stanley and Salomon Smith Barney before he met Lee. In 1999, Lee met Kim and established the LKeBank, BBK and EBK Securities with Kim. Kim was investigated for embezzlement and securities law violations. But, he was found to be "not guilty" by the U.S. District Court.
Document 11: Ivan Boesky: Ivan Frederick Boesky (born March 6, 1937) is a former American stock trader who is notable for his prominent role in an insider trading scandal that occurred in the United States during the mid-1980s.
Document 12: Bradley D. Simon: Bradley D. Simon is the Founding Partner of Simon & Partners LLP, which represents both corporations and individuals in the areas of white collar criminal defense, complex civil litigation and corporate compliance. Mr. Simon started the firm in 1998 with a New York City office, and has since grown the business with presences in Washington D.C., and most recently London. Mr. Simon has represented several defendants involved in high-profile cases, including: Alan Hevesi in connection with then New York State Attorney General, Andrew Cuomo, investigation into the New York State Pension Fund scandal., David Chang in connection with bribery and corruption charges that led to the resignation of former New Jersey Senator Robert G. Torricelli., UK Solicitor Jeffrey Tesler against charges of violating the Foreign Corrupt Practices Act when working with Halliburton in Nigeria and James Marquez of Bayou Hedge Fund Group in the first-ever criminal prosecution of a hedge fund. Through aggressive representations, Mr. Simon has earned a reputation as a strong advocate for clients in highly public, combative cases, as stated in the "New York Times" story with regard to Alan Hevesi’s choice to switch lawyers in the middle of his defense.
Document 13: Mathew Martoma: Mathew Martoma (born May 18, 1974 as Ajai Mathew Mariamdani Thomas) is an American former hedge fund trader. As a former portfolio manager at S.A.C. Capital Advisors, a Stamford, Connecticut-based hedge fund, he was accused of generating possibly the largest single insider trading transaction profit in history at a value of $276 million. On November 20, 2014, he began serving a nine-year prison sentence.
Document 14: Sergey Aleynikov: Sergey Aleynikov is a former Goldman Sachs computer programmer. Between 2009 and 2016, he was twice prosecuted for the same conduct of allegedly copying proprietary computer source code from his employer, Goldman Sachs, before joining a competing firm. His first prosecution in federal court in New York ultimately resulted in acquittal by the United States Court of Appeals for the Second Circuit. The outcome of his second prosecution and trial in New York state court was a split verdict dismissed by court, which acquitted him on all counts. That order of dismissal was later overturned by New York intermediate appellate court. He is currently appealing that decision in New York Court of Appeals . His story inspired Michael Lewis's bestseller "Flash Boys".
Document 15: Rengan Rajaratnam: Rajarengan "Rengan" Rajaratnam (born 1971) is a hedge fund manager. He is the founder of hedge fund Sedna Capital and the younger brother of convicted hedge fund founder Raj Rajaratnam. He was arrested for securities fraud in March 2013. His trial in New York City began in June, 2014 but he was found not guilty by the jury in July 2014.
ground_truth: Raj Rajaratnam