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Aon Corporation has hired David Prosperi from Chicago Mercantile Exchange (CME) as global vice president of public relations. Prosperi will be responsible for coordinating and managing the company's global public relations strategy to effectively articulate to external stakeholders the distinctive value Aon brings clients. He also will serve as the company's corporate spokesman. Before joining Aon, Prosperi served as managing director of corporate marketing and communications at CME. Previously, he served as senior vice president of corporate communications and assistant to the president of Chicago Board of Trade....