Aaron Brown is risk manager for AQR Capital Management in Greenwich, CT. He holds degrees in applied mathematics from Harvard University and finance from the University of Chicago. He has worked as a trader, portfolio manager, head of mortgage security, and risk manager for such Wall Street firms as Morgan Stanley and Citigroup; taught finance at Fordham and Yeshiva universities; and ran a public mutual fund. Mr Brown is the author of The Poker Face of Wall Street.