ESSI - Electronic Security Services, Inc. - is a security systems integration company headquartered in Upper Marlboro, Maryland. The company has more than 40 years of demonstrated high quality experience in design, engineering, assembly, installation, testing, maintenance and management of electronic security systems for federal, state and local governments, financial institutions, car dealerships, churches, schools, colleges and universities, hospitals and nursing homes, industrial facilities, apartment buildings, condominiums and gated communities.