PDI Investigations, Inc.
National and International Investigative Agency

PDI Investigations conducts a comprehensive National and International investigation practices from its headquarters in Clayton, MO. For the last 20 years, the firm has assembled the most relied upon professional agents operating under one of the most experienced management teams in the industry. Many of our agents have had extensive investigative experience prior to joining the firm. Because our client profiles are extremely diverse, ranging from large international companies, international law firms, domestic law firms, and private individuals, our agents are carefully chosen to handle the complex issues that confront our clients. It is our position to maintain a close personal relationship both with our clients and the members of our investigative team. Divisions organize our firm: Corporate, Domestic, Civil and Criminal, to enhance our professional competence and our ability to serve our many different clients.  No matter where you are located on the globe PDI can quickly attend to your needs.

Protective Services InvestigationAffiliate Offices Worldwide Include:
Central and South America, the Pacific Rim, China, and Central Europe

"The Dangers of Internet Dating" - Featuring Michael Barbieri, Ph.D. on 1380 AM "The Woman"

International Investigations

PDI utilizes years of experience and vast global resources to provide timely and professional international executive protection and investigative services. Our accredited staff will help uncover information pertinent to your needs to get you the answers you desire. Some of our expertise includes personal / corporate protection and intelligence gathering, surveillance, kidnappings for ransom, and unresolved international murder investigations.

Criminal Investigations

PDI investigates criminal cases and assists the legal community with criminal investigations and witness protection. Our team provides computer forensic services, risk assessments, threat analysis, and detailed criminal investigations to aid your legal teams with compelling evidence for their cases.

Civil Investigations

PDI provides civil investigations that allow the legal community to build evidence for their civil cases. Through asset searches, video surveillance, insurance fraud investigations, workers compensation investigations, background checks and personal injury investigations, PDI’s expert team of investigators will conduct video surveillance and undercover work to perform professional civil investigations


Corporate Security & Executive Protection

PDI protects the corporate world by specializing in executive protection whether travels are domestic, international, major economies or 3rd world countries.  With the ability to assemble a team within 48 hours worldwide, PDI can send advance teams, arrange for air and ground transportation protection, and prepare evacuation details / routes to minimize exposure for your key executives and employees.

Domestic Investigations

PDI is the largest domestic investigative firm in Missouri.  PDI’s domestic services include but are not limited to video surveillance, divorce modifications with regards to child custody issues and alimony, parenting plans, asset searches, and background checks. Whether you are suspicious about a cheating spouse or concerned about a personal threat, PDI will employ their experience to fulfill your domestic investigation needs. Professional, Discrete.



Michael Barbieri, Ph.D. - Criminal Investigation Expert Analyst discussing a serial murderer investigation.

Michael Barbieri, Ph.D. - Executive Security Consultant, is Interviewed about the kidnapping of NBC Reporter Richard Engels