Notice: American Express, Ogilvy & Mather, and Digitas, Inc. Sued in Intellectual Property Dispute Over 'My Life, My Card' Campaign by Thomas O'Keefe Through His Attorneys Newberg & Winters LLP NEW YORK, Sept. 19, 2006 (PRIMEZONE) -- Thomas O'Keefe has filed a lawsuit against Ogilvy & Mather Worldwide, Inc. (a subsidiary of WPP Group plc) (Nasdaq:WPPGY), Digitas, Inc. (Nasdaq:DTAS) and...