GMMB is a full-service advertising and marketing agency headquartered in Washington, D.C. GMMB was founded in 1986 and has since grown to become one of the largest independent communications firms in the world. GMMB provides a wide range of services, including advertising, public relations, digital marketing, and strategic communications. The agency has worked with a number of high-profile clients, including the Bill and Melinda Gates Foundation, the Obama-Biden campaign, and the American Cancer Society. GMMB is known for its innovative and effective campaigns, and has won numerous awards for its work.