P.O. Box 444
Blackstone, MA 01504
Office: 508-876-9113

We have the services you or your company need.


Greene Shield Protection is a full-service private detective agency established in 2009 by Retired Captain Thomas G. Greene of the Massachusetts State Police. Greene Shield Protection was founded with the vision of creating a new kind of private investigation firm and to consistently strive to provide all our clients with efficient, cost-effective investigations in a timely fashion. 

press conference - greene shield protection

Thomas Greene is a Private Detective, bonded and licensed by the Commonwealth of Massachusetts, License # P-1681.

Greene Shield Protection delivers the highest level of investigative and security management to you or your organization. Our services are available to corporations, law firms, insurance companies as well as private individuals. Greene Shield Protection provides effective safety, security, and investigation by applying years of experience, education, resources and technology.

With more than 28 years of investigative experience, Greene Shield Protection understands the intricacies involved in gathering evidence for the courtroom. Working in cooperation with law firms, corporations and their counsels, we help you ensure that evidence is relevant, accurate, properly obtained and decisive.


Oftentimes, law firms require access to timely and relevant information to meet the growing demands of their firm and clients. Our services help you accurately determine the facts, assess the strengths and weaknesses of your case, know your opposition, and evaluate witnesses through efficient, ethical, and legal intelligence gathering.

Whether the situation is professional or personal, we deliver highly effective, discreet and tailored solutions for our clients. If you would like to learn more about Greene Shield Protection and our services, browse our web site, email or call 508-876-9113. A free and confidential in-person consultation is offered.

We invite you to watch a video of Tom Greene’s law enforcement career.
Click here to view the video