Roy Spence, born October 10, 1948, is an American business author, advertising executive, and marketing expert. He is best known as the co-founder of GSD&M, a prominent advertising agency based in Austin, Texas. Spence has authored several bestselling business books focusing on corporate purpose, brand building, and marketing strategies. His philosophy that "it's not what you sell, it's what you stand for" has significantly influenced modern business thinking. As a business thought leader, Spence has dedicated his career to helping companies discover their core mission and achieve sustainable growth.