Bentley Associates, Inc. - http://www.bentley-associates.com/ Firm conducts domestic and international investigations. Based in Andover.
Read Investigative Services - http://capecodpi.com Agency is based in Mashpee, and focuses on auto insurance investigations, surveillance and workers comp cases.
Strategic Research - http://www.srresearch.com/ Based in Cambridge, MA and is headed by a former investigative reporter. They specialize in complex business litigation and due diligence.
CGM Private Detective Group - http://www.cgmprivatedetectivegroup.com/ Provides services for fire investigation, theft, skip tracing, stolen property recovery, due dilligence searches, counter surveillance and executive protection.
Nardizzi & Associates, Inc. - http://www.nardizzi.com Boston firm specializes in business litigation and intellectual property matters. Also handles wrongful convictions cases on both pro bono and fee basis.
Orion Investigations - http://www.orioninvestigations.net Based in Stoneham, the firm provides investigations for the legal profession and insurance industry. They also handle domestic cases.