Clandestine Services Agency

CSA is a full service investigative and security consulting firm. Headquartered in Chicago, Illinois, CSA operates throughout the United States with affiliate offices around the world.

Initially founded to meet the need for a professional physical surveillance group CSA has, through a single affiliation with Quest Consultants, expanded its services to include all areas of investigation and security consulting.

With unparalleled professionalism, discretion and confidentiality, CSA provides its services to multinational corporations, law firms, financial institutions, labor unions, government agencies, educational institutions and regional school districts, and private clients.

The expertise of CSA lies in the experience and credentials of its personnel. Our expert consultants are comprised almost entirely of former FBI Agents and personnel, each serving in an area of investigative or security expertise.