Volutone, 3960 Garner Rd, Riverside, CA 92501, US

Thompson Engineering specializes in the design and installation of telecommunications, nurse call, sound, access control, TV signal distribution, security, closed-captioned television, low-voltage control and media systems. The company, which maintains operations in Riverside, Calif., provides its services to Riverside, San Bernardino and Orange counties in California. With more than 100 systems in place in school districts, the company is a recognized leader in the educational market. But Thompson Engineering also offers its systems to health care, professional sound reinforcement and security companies. Systems Contractor News ranked Thompson Engineering No. 37 on its list of the top 50 systems integrators in the United States.