1986 - Mr. Sorrell, the engineer behind Saatchi's legendary agency aquisition strategy, leaves to join WPP full time.
1986 - At WPP, Mr. Sorrell begins acquiring below-the-line advertising companies, turning WPP from a shopping-cart marketer into a marketing-services specialist.
1987 - WPP completes a hostile takeover of J. Walter Thompson Co. for $566 million.
1989 - WPP acquires Ogilvy & Mather for $864 million.
1992 - WPP forms CommonHealth, a worldwide health-care network.
1993 - WPP sells Fallon McElligott, Minneapolis, for $14.6 million.
1997 - WPP forms Intuition Group, a spinoff of J. Walter Thompson USA, focusing on marketing to women.
1997 - WPP buys a minority stake in U.K. public relations group HHCL & Partners.
1997 - WPP opens its first MindShare unit, the merged J. Walter Thompson Co. and Ogilvy & Mather media operation, in Hong Kong.
1998 - WPP opens MindShare in the U.K.
2000 - WPP opens it first U.S. MindShare unit in New York.