Carroll Hollingsworth, and friend Paul Denwalt, founded D H Marketing in 1989. Carroll and Paul had worked together for many years at International Crystal in Oklahoma City. There they both began their careers in the technical side of the "Wireless Industry" then migrated to sales, marketing and management.
 
While at International Crystal, Carroll and Paul started an Independent Manufacturers Representative program. They spent several years managing their Rep network, while traveling the country meeting with both the Reps, and their Customers. They soon learned that there was a real need for both the Manufacturer and the Manufacturers Representative to better understand the others role and responsibility. They became members of several industry organizations that provided training and education programs to Reps and Manufacturers. Paul and Carroll became advocates of Professional Reps who were trained; skilled, ethical reps that woul d better serve both the Manufacturer and more importantly their Customer.
 
In 1989 Paul Denwalt and Carroll Hollingsworth founded D H Marketing with a desire to have an Independent Manufacturers Company that would provide both its Customers and its Manufacturers with a Professional, Ethical, Dedicated and Experienced sales and marketing company. D H Marketing is a long time member of the Communications Marketing Association (CMA), and Manufacturers Representatives Educational Research Foundation (MRERF). These two organizations provide continuing education and training to both Manufacturers and Independent Manufacturers Representatives, including the MRERF Certified Professional Manufacturers Representatives (CPMR) certification.
 
D H Marketing and its staff are members of several industry organizations, including The Radio Club of America (RCA), APCO and numerous public safety and wireless associations. Carroll Hollingsworth is an elected bo ard member of both The Radio Club of America and Communications Marketing Association. Carroll is an advisor to the Texas APCO board of directors where he has coordinated an IP training program for two-way radio technicians. Carroll has worked with the Radio Club of America to develop, plan and implement an ongoing IP course that will benefit public safety two-way radio technicians.
 
D H Marketing continues to strive to be the best professional manufacturers representative company possible. The D H sales staff  participates in continuing educational programs, including the MRERF Certified Professional Manufacturers Representative (CPMR) program. D H Marketing continues to implement technology to better serve both its Customers and the Manufacturers that it represents.