Some of the biggest hedge funds in the world are facing a problem that's proving just as challenging as predicting the markets. The Wall Street Journal has a story on that very conundrum, reporting on the tension at the $60 billion hedge fund Two Sigma between cofounders John Overdeck and David Siegel. While the structure of the modern hedge fund dates back to the 1940s, the industry really hit its stride during the 1990s. But I imagine not every hedge fund will want to go that route. And here's more on how hedge funds like Citadel and Millennium are transforming themselves with the help of Goldman Sachs' alumni.

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Persons: Dan DeFrancesco, we've, cofounders John Overdeck, David Siegel, Overdeck, Siegel, cofounders, Goldman Sachs, Tracy Gray, Zhenni Liu, Wil Chockley, Charlie Hanna, Peter Deaner, Jeffrey Epstein, Jes Staley, Epstein, CliffsNotes, Bill Ackman, We've, Jeffrey Cane, Hallam Bullock Organizations: Sigma, Citadel, MaC, Marcy Venture Partners, JPMorgan, Columbia, Bloomberg, Financial Times, Pershing Square Capital, LinkedIn Locations: NYC, Los Angeles, Swiss, New York, London