Guardsmark is one of the leading security services companies in the United States. Founded in 1963, the company specializes in executive protection, background screening, design and development, asset management, loss prevention and private investigation services. It offers services to the manufacturing, distribution, health care, financial, petrochemical and utility industries. Guardsmark has a staff of trained armed and unarmed security guards. The company provides external surveillance, detailed inspection, and evaluation and security arrangement services. In addition, it offers 24-hour emergency services to residential, commercial and industrial customers. Its library offers a range of books that provides guidance on security concerns. Guardsmark maintains a presence in Houston.