American Security & Investigations operates as a comprehensive security and investigations firm headquartered in St. Paul, Minnesota. Since 1959, the organization has served clients throughout the upper Midwest, establishing itself as the largest independently owned, full-service security agency in the region. The company delivers technology and personnel solutions to sectors including commercial and residential real estate, healthcare, education, corporate complexes, manufacturing, industrial facilities, and government entities.
The firm manages a workforce of over 1,200 employees to support static on-site security, emergency staffing, temporary coverage, and special events. Security programs are tailored to specific client needs, with uniformed professionals trained for diverse facility types. Beyond physical presence, the company offers remote video and alarm response through an internal Security Operations Center. Partnerships with vetted manufacturers allow for advisory support on implementing video and access control projects.
Investigative services cover background checks, pre-employment screening, surveillance, legal assistance, risk management, and workplace safety investigations. As a member of the Marsden Holdings network, the company can bundle security with janitorial and HVAC services to improve operational and budgetary efficiency. In addition to the St. Paul headquarters, offices are located in Madison and Milwaukee, Wisconsin; Des Moines, Iowa; Omaha, Nebraska; and Phoenix, Arizona.