Gregory Welteroth Advertising (GWA) is a privately-held advertising and marketing company that specializes in media buying strategy, cooperative retailer-based programs and national branding campaigns. Located in central Pennsylvania, we have spent the past 30+ years working with national and international brands to create programs that increase sales and brand awareness. We are not your typical agency, and we have no intention of being one. We’re not in business to win awards; we’re in it to save you money, sell products, overcome competitors and make a noticeable difference in your bottom line. Period.