Cornerstone Promotion is a marketing and branding firm that serves the music, film, technology, and fashion industries by specializing in urban and alternative lifestyles. The firm uses viral marketing and other nontraditional marketing disciplines to influence the cool trendsetters and early adopters. Cornerstone Promotion has provided brand consulting, radio promotion, field marketing, digital marketing, and event marketing services for such clients as Levi Strauss & Co., Coca-Cola, Converse, and Proctor & Gamble. Music industry veterans Rob Stone and Jon Cohen launched the firm in 1996, with Sprite as a major customer. Cornerstone Promotion operates from offices in Chicago, Los Angeles, and New York.