Founded in 1963, Guardsmark, LLC, is one of the largest security firms in the world. The company provides security, investigations, consulting and background screening services. Additionally, it provides specialized services, including worldwide executive protection, emergency operations, along with white-collar and computer crime programs The firm serves clients in more than 400 cities, with offices located across the United States, Canada, Puerto Rico, United Kingdom, France and Singapore. Guardsmark, LLC is an ISO 9001:2000 registered company.