Patricia Cook has been named chief investment officer of the public fixed-income business at Prudential Investment Management of Newark, N.J. Before joining Prudential, Cook was a managing director of alternative investments for Fischer Francis Trees and Watts of New York.

Kenneth Winston has joined Oppen-heimerFunds of New York as senior vice president and head of risk management, quantitative research and product development. Previously, Winston was a principal at Richards & Tierney of Chicago.

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