Mather offices including Ogilvy & Mather Direct and Ogilvy & Mather Public Relations; Scali McCabe Sloves Group; and several independent associate agencies, such as Cole & Weber. Kenneth Roman, president of Ogilvy & Mather United States, was named president of Ogilvy & Mather Worldwide. and was promoted to chairman in 1987. He became chairman of the Ogilvy Group in 1988, succeeding Graham Phillips. In 1989, WPP plc, a British advertising holding company, acquired the Ogilvy Group for $864 million, which, at the time, was the most ever paid for an advertising agency. David Ogilvy initially resisted the sale, but eventually accepted the title of WPP honorary chairman, a position he relinquished in 1992. Following the departure of Roman for American Express in 1989, Graham Phillips became the chairman and CEO of Ogilvy & Mather Worldwide. 1990s In 1992, Charlotte Beers replaced Graham Phillips as chairman and CEO of Ogilvy & Mather Worldwide. Philips remained as vice chairman. Beers was recruited from the Tatham, Laird & Kudner advertising agency and was the first "outsider" to lead Ogilvy & Mather. She was also the first woman to lead a major international agency. Beers introduced the concept of "brand stewardship" to the agency, a philosophy of brand-building over time. She is also credited with helping Ogilvy & Mather bring in new business after a downturn. In 1994, then–North America president Shelly Lazarus and Beers helped win the entire global account of information technology corporation IBM for the agency. Worth an estimated $500 million in billings, it was the largest account shift in the history of advertising. After four years, Beers stepped down as CEO. Lazarus, a 23-year veteran of the agency, was appointed CEO in 1996 and became chairman the next year. It was the first time a woman succeeded another woman at a major agency. Lazarus further developed Beer's brand stewardship approach by introducing "360-degree branding", the idea of communicating a brand message at every touchpoint the brand has with people. David Ogilvy died at age 88 in the Château de Touffou, his home, in July 1999. 2000s Ogilvy purchased the Federalist Group, a Republican lobbying firm, in 2005. The Federalist Group subsequently changed its name to Ogilvy Government Relations. The firm is known for lobbying against climate change mitigation efforts on behalf of some of the biggest oil and chemical groups in the world. In 2005, Shona Seifert and Thomas Early,