Aaron Brown is risk manager at AQR Capital Management in Greenwich, Connecticut. His previous books are The Poker Face of Wall Street (John Wiley & Sons, 2006, selected one of the 10 best books of 2006 by BusinessWeek) and A World of Chance (with Reuven and Gabrielle Brenner, Cambridge University Press, 2008). In his 30-year Wall Street career, he has been a trader, portfolio manager, head of mortgage securities, and risk manager for institutions including Citigroup and Morgan Stanley. He also served a stint as a finance professor, and was among the top poker players in the world during the 1970s and 1980s. He is a regular columnist for two financial journals: Wilmott and Quantum and contributes frequently to the professional literature in journals, periodicals, and book chapters. He holds degrees in Applied Mathematics from Harvard and Finance and Statistics from the University of Chicago Booth School of Business. He lives on the Upper West Side of Manhattan with his wife, Deborah Pastor, and has two children, Aviva who goes to high school and Jacob who is an undergraduate at the University of Chicago.