GSD&M is an advertising agency headquartered in Austin, Texas, United States. It was founded in 1971 by graduates of University of Texas at Austin – Roy Spence, Judy Trabulsi, Tim McClure and Steve Gurasich, and others, as AdVantage Associates. After the 1972 political campaign for former Texas Senator Ralph Yarborough, it re-organized with the 4 principals, as GSD&M. Since 1998, GSD&M has been part of the Omnicom Group. A satellite office is located in Chicago, Illinois.