Experienced Investigation and Security Professionals

O'Brien & Associates is a full service, licensed and insured private investigation and security agency founded in 1990 by Ed and Karin O'Brien. They have been involved in law enforcement for over 40 years. O'Brien & Associates currently employs twenty licensed investigators in five states, with additional support staff. We currently have over 200 employees in all areas of investigations and security. 

Our licensed personnel and advisory staff offer over 50 years of experience in investigating criminal charges, civil complaints, insurance fraud, and various other financial crimes. We have been involved in parent-locator searches, skip tracing, asset/criminal history searches nationwide, and adoption locations guaranteed.

With personal contacts in every major U.S. city, as well as in-house computer access to millions of databases, and a highly trained staff, we can provide the most efficient and effective results available anywhere. Our rates are extremely competitive, and we have built our reputation on competent, professional, cost effective service with timely results. We are also a member of NAPPS (National Association of Professional Process Servers).


Our staff specializes in investigations, surveillance, loss prevention, security and process service. Read more.


Our agency specializes in the prevention and detection of fraud in government entitlement programs. Read more.


Our professionals manage in-store security programs focusing on external shoplifting, internal theft and various fraud. Read more.

Event Security  Read more.

Our event staff are highly trained and professional. Contact us for details on how to better secure your festivals.