One day in the middle of 2008, Sakhawat Khan, a Silicon Valley chip engineer, walked into a small house near the back of his two-acre property that his wife, Roomy, a stock trader, used as a home office. Roomy and Sakhawat met when they were electrical-engineering students at Columbia University. After graduating, Sakhawat started inventing, eventually gathering some 30 semiconductor patents to his name. Roomy, who was more outgoing in social situations and more restless in her appetite for risk, was drawn to Wall Street and joined Galleon Group, a New York hedge fund run by the charismatic, bullish trader Raj ... (full story)