GSD&M Idea City is an advertising and marketing agency based in Austin, Texas. The company was founded in 1971 and has since grown to become one of the largest independent agencies in the United States. GSD&M Idea City offers a range of services, including brand strategy, creative development, media planning and buying, and digital marketing. The company has worked with a number of high-profile clients, including Southwest Airlines, BMW, and the United States Air Force. GSD&M Idea City is known for its creative approach to advertising and its ability to develop campaigns that resonate with consumers.