Brown taught at Millikin University in Decatur, Illinois from 1946 to 1964. During that time, the university wanted him to get his doctorate, but he did not want to follow that path. He began to immerse himself in business, and in 1947 he started a soft water service.

In 1955, Brown started Muniquip (short for Municipal Equipment). He made speed timers by stretching two hoses across a road, and soon branched out into radar. By 1963, the radar portion of Muniquip had annual sales of a million dollars.

In 1964, Brown left Millikin University to focus on the radar company. A Toronto firm was interested in his other products, and bought them along with the company name two years later. Brown kept the radar portion, and renamed the company Decatur Electronics, Inc.

In 1969 Brown moved Decatur Electronics to the current facility at 715 Bright Street. As Brown developed the business, he developed new products, including speed timers to control traffic and a radar gun specifically for use in baseball.

Brown designed and developed revolutionary radar products in the following years, including the first directional radar. While the sales were good internationally, the directional product was "too advanced" for the domestic market and did not sell well in the United States. Brown had success with the RaGun, the MVR, and the Hunter radar guns.

In October of 1977, an article in the Decatur Herald & Review about Decatur Electronics quotes Bryce Brown as saying that sales of police radar were expected to reach $3 million that year, which represented a 50% growth over the previous year, and a 500% growth over a 5-year period. Brown explained that sales were booming because the federal government began paying for police departments to get radar equipment. He also said CB equipment and radar detectors were not very effective against the new moving radar units. Decatur Electronics had 80 employees at that time. In anticipation of an economic downturn in the radar business, other product lines were added such as breath analyzers and devices to help control traffic signals, and gate and ticket issuing machines for parking lots. Brown was considering adapting the radar to use in rail yards, as an altimeter for small planes, and to protect small boats from being hit by larger ones in a fog.

Another newspaper article from May 14, 1986 quotes the company President Courtland Moody as saying that Decatur Electronics produced "the only radar gun that can tell a police officer whether the car he is monitoring is coming forward or going away from him." He also said, "General Motors" engineers have called many times looking for help in trying to apply certain technologies in this small technological niche." The article presents a client list including General Motors, Ford Motor Co. and other automakers, the FBI, NASA, BOEING aircraft, Indianapolis 500, military bases and boat manufacturers. The article goes on to mention sales in more than 70 countries and in all 50 states. At the time, Decatur Electronics was also the primary supplier for major league baseball teams. This same year, Decatur Electronics was issued a patent on a speedometer cable input to radar.

In 1989, Decatur Electronics came under new ownership when retired businessman Bob Sanner invested in the company with a vision to spark and grow his new company in a competitive business environment.

Bob set out to learn all he could about radar and about the law enforcement industry. He drove throughout the country, calling on departments of all sizes, and asking what they would like to see in new products. As part of his strategy to turn the company around, Bob hired some young engineers and reorganized the entire company.

During the evolution of the business, Bob enlisted the help of his son, Randall, to drive strategic alliances and acquisitions that developed into a true success story. Randall served the company from 1994 to 2005, excelling in process efficiency and productivity.

In 1991, the revitalized Decatur Electronics released its Genesis I radar. This technologically advanced radar was the beginning or "Genesis" of a revolution in the law enforcement and radar industry. Decatur Electronics was issued a patent on the Genesis I unit, and another on the unique Patch Antenna. Decatur's new equipment met the demand for smaller units and generated an industry buzz over the new technology. Before the competition could catch up, the Genesis II was released. The Genesis II was even smaller and more advanced than previous radars, and customers loved it.

Decatur revolutionized the industry again by instituting the first 2-day in-factory turnaround guarantee to provide the best customer service and quality product. That turnaround time is unmatched to this day by any radar company.

In 1997 Decatur introduced an innovative handheld radar which utilizes the Black & Decker VersaPak battery system. In 2000, Decatur introduced the SI-2, its newest high-tech microwave sensor. Also in 2000, Decatur expanded its product line when it began shipping its revolutionary Gemini In-Car Video System. In 2001, speed and message trailers were added to Decatur's product offerings, enhancing the company's suite of traffic safety solutions. In 2003, the company further expanded to offer specialized law enforcement vehicle outfitting through its TW Mobile Engineering division in California. In late 2004, Decatur released its best-selling GHD handheld directional radar as the lowest priced radar in the United States, setting new benchmarks for value, quality and pricing.

Since the early 1990s when Bob took the reins of DEI, the company's sales have grown more than 2,000 percent. The company has led the industry as one of the fastest growing radar companies in America.

Bob currently serves as Chairman Emeritus, having retired as Chairman of the Board in 2003.