Wexler & Walker Public Policy Associates knows its way around the political corridors of Washington, DC. A unit of public relations firm Hill and Knowlton (a division of ad giant WPP Group), Wexler & Walker helps companies and industries win friends and influence people in government, trade associations, institutions, and the general public. Founded in 1981 by Anne Wexler (who served President Jimmy Carter), the lobbying firm generates support for clients in such areas as taxes, trade, insurance, transportation, and legal reform. It has been involved in campaigns supporting NAFTA and normal trade relations with China, among other issues. Clients have included General Motors, Wyeth Pharmaceuticals, and Visa.