Goodby Silverstein & Partners is a subsidiary of Omnicom Group, a strategic holding company that manages a portfolio of companies worldwide. Its companies operate in the disciplines of advertising, marketing services, specialty communications, interactive and digital media, and media buying services. The firm has three globally known brands BBDO Worldwide, DDB Worldwide and TBWA Worldwide. Its leading United States based advertising agencies include Arnell Group; Goodby, Silverstein & Partners; GSD&M; Martin/Williams; Merkley + Newman; Harty Partners; and Zimmerman Partners. Omnicom s diversified agency services consist of more than 100 companies that provide services in direct marketing consultancy, public relations, promotional marketing and specialty communications. Omnicom s leading media agencies are part of OMG and the group consists of two media companies, OMD Worldwide and PHD Network, as well as several media specialist companies. Goodby Silverstein & Partners maintains offices in San Francisco.