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Meet David Ollivier

David Ollivier, the founder of Blackstone Investigations Group, is an experienced private investigator licensed in the state of New Jersey (NJ License #9448). David is also a proud member of the New Jersey Licensed Private Investigators Association (NJLPIA), an organization committed to connecting New Jersey residents with qualified and experienced private investigators. In addition to being a seasoned private investigator, David also has many years of experience as a law enforcement officer and detective.

Before his private investigation career, David proudly spent six years serving our great nation in the United States Marine Corps as a Military Police Officer. He received an Honorable Discharge and spent the next 15 years dedicated to serving the public through his civilian work in the law enforcement field. Throughout his career, David worked with private citizens, local and state governments, and federal government agencies including the FBI, DEA, and Homeland Security; he completed countless investigations training sessions and received over 35 Letters of Commendation from private citizens and numerous Law Enforcement agencies, highlighting his work ethic, professionalism and dedication to the community he served. David also holds a national certification in Interviews and Investigations from Wicklander-Zulawski and is experienced in handling a variety of sensitive and high-profile cases, including property crimes, missing persons, domestic abuse and violence, traffic homicide investigations, insurance and workers comp fraud and liability, and negligence related issues.

David takes pride in serving the state of New Jersey as a trusted private investigator as well as being an involved member of his church and his local community. David, a former United States Marine and law enforcement officer, is an experienced investigator with a successful track record that speaks for itself. You can count on professional and confidential private investigation results from David Ollivier and Blackstone Investigations Group.

He’s Here When You Really Need To Know!


  • Marine Corps Veteran