In 1988, Hull formed Monitronics International Inc. The concept behind the alarm monitoring company was to focus on three objectives: find high-quality dealers, purchase high-quality customer contracts from those dealers and provide high-quality service to the customers.
The formula for Monitronics worked well as the company began to grow rapidly. It was named to the Inc. 500 list of Fastest Growing Private U.S. Companies for seven consecutive years. At the end of 2005, the company served approximately 485,000 subscribers nationwide.