Since 1983, PhaseOne Marketing & Design has been a full-service advertising agency. Located in Sunbury, Pa., the firm caters to the needs of regional, national as well as international clients with a wide range of in-house marketing and design services. It makes available advertising services, such as print/web site design, marketing and prepress. In addition, the firm offers clients search engine optimization services and photography options. PhaseOne Marketing & Design has worked with clients, including Zyvax of Georgia and Leer Truck Caps of Indiana.