Over Two Decades of Excellence Phase Four Marketing Incorporated represents clients of all sizes, both locally and nationally. Our years of experience, coupled with our full-service capabilities make us the obvious choice for your next project. We offer professional turn-key services, beneficial in ways our competition hasn’t even thought of. 25 years experience producing advertising programs that work. Phase IV Marketing has provided services for single store retailers as well as national chains. Offices in Bolivar, Ohio and Poland, Ohio prevent delays due to natural disasters, power outages, etc.