Hadfield Communications - Full service advertising agency located in Houston, Texas. Specializes in advertising and marketing for the food industry, as well as being a full service agency for other sectors. Heavy Creative - Provides print, television, consumer and Internet advertising. Hellman Associates - Marketing and advertising agency with national and international clients, specializing in conception through completion campaigns and project marketing. Hanna Advertising - Full service advertising and marketing agency. Haviland Communications, Inc. - A full service advertising, public relations and investor relations agency. The Halo Group - Creative marketing communications company, based on Manhattan, serving national, international and regional clients. Holberg Design - A full service advertising agency providing creative marketing, public relations, web development and graphic design services.