We are a Tulsa-based, full-service detective agency offering investigative and consulting services across the state and country. We have the experience, resources, and tenacity to uncover the truth and deliver results.Learn More
Cullen Investigations is a full-service licensed and bonded private investigations agency based in Tulsa, Oklahoma. We offer a wide array of investigative & consulting services, including domestic relations (custody, infidelity), background checks, crisis management, complex litigation, and criminal defense investigation from pre-filing to post-conviction relief and death row appeals.
Civil & Complex Litigation
Due Diligence Investigations
Statewide Process Service
“The fact of private investigator Eric Cullen’s involvement, more than any innate self-corrective mechanism in the judicial system, was the critical factor in these cases. Had he not come along, and had he been less persistent, the men would likely still be incarcerated—and would have remained so until their deaths.”
— Washington Post 2019 editorial, “Two extraordinary exonerations show the failure of our justice system”
The genesis of Cullen Investigations began in 2001, when Eric Cullen’s best friend died senselessly and tragically while in police custody.
The son of a respected homicide detective, Eric originally thought he would become a cop. But in the wake of his friend’s death, he became acutely aware of the injustices that plague our legal system. He realized he could make a bigger difference on the outside, as a private investigator. In 2005, he founded Cullen Investigations.
Over the next 15 years, the modest agency blossomed into a full-service investigations firm—one of the most respected in the country. Today, Cullen and his team of investigators carry a reputation for delivering measurable results through dedicated, effective, honest work.
Ready to make an appointment? Complete the form below and one of our investigators will contact you shortly.