About Us
Our History
Our Credentials
Superior Service
Our Professionals
The Area We Service
GLESSNER services thousands of households in Maryland, Virginia, West Virginia, Pennsylvania and the District of Columbia, earning it the reputation as one of the most highly respected security and communications companies in the region. We service such clients as the United States Army, United States ATF, United States Coast Guard, National Park Service, United States Department of Energy, Air National Guard, Department of Social Services, MCI/MCTC and Federal Aviation Administration. We are bonded and insured and involved with respected organizations as:
  • Underwriters Laboratories
  • National Fire Protection Association

  • National and Maryland Burglar & Fire Alarm Association
  • Area’s exclusive dealer for First Alert systems
  • Area’s exclusive dealer for IWATSU telecommunications
  • Area’s exclusive dealer for Gamewell commercial fire systems Our expertise goes beyond the cutting edge. Companies have such confidence in our abilities that we often serve as a “test environment” for products being developed by many of the world’s leading security and telecommunication manufacturers.