Paul Taaffe becomes chairman and CEO of Hill and Knowlton, replacing Howard Paster, who joins parent company WPP Group as EVP, public relations and public affairs. Taaffe was president and CEO of two of the firm's five regions ... Another WPP subsidiary, Ogilvy Public Relations Worldwide, makes a CEO switch, appointing Marcia Silverman chief exec. Silverman replaces Bob Seltzer, who leaves to pursue other opportunities. Silverman was president of the Americas for Ogilvy.
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