Founded in 1959. American Security LLC is one of the largest independently owned. FULL-SERVICE security agencies in the midwest. Located in phoenix. Ariz. . The Company provides security. Investigative and consulting services. It offers business protection by offering internet protocol (IP) video and REAL-TIME remote surveillance with live security guards. American Security LLC employs nearly 1.500 professionals providing security and related services. Its major clients include LACIEL apartments. LIFECARE hospital. ETC. American Security LLC has partnered with NORTHWRITE. IVEDA solutions. INFRAGARD and Marsden holding. It is a subsidiary of Marsden holding L. L. C. . Which is one of the largest privately owned security and facility service providers in the united states.