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Brock Capital Group L.L.C. partner Karen Horn recently joined Norfolk Southern Corp.’s board.

She previously served as president and managing director of global private client services for Marsh & McLennan Cos. Inc. Horn also has held such positions as managing director and head of international private banking for Bankers Trust, president of the Federal Reserve Bank of Cleveland, treasurer of Bell Telephone Co. of Pennsylvania, and vice president and economist for the Bank of Boston.