About the Author
Tim McClure is a brand architect, author, filmmaker, and legend builder. He is one of the founders of GSD&M, one of America's most successful advertising agencies. He is also the creator of the legendary "Don't Mess With Texas" slogan and antilitter campaign.
Roy Spence is also a founder of GSD&M. He has been profiled in USA Today, recognized as an "Agency Innovator" by Advertising Age, and named "Adman of the Century" by Texas Monthly magazine.