PRECISION. DISCRETION.
RESULTS.

Cullen Investigations is a Tulsa-based private investigations and consulting agency serving clients across the state of Oklahoma and beyond. We provide a wide array of investigation services and support to individuals, law firms, and corporations.

Services

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22+ Years Of Experience

Why Choose Cullen Investigations?

Our licensed investigators, legal consultants and expert resources bring deep experience and professional tenacity to every case. From targeted surveillance and witness interviews to trial preparation and litigation support, we operate with clarity and purpose to deliver results that matter.

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Our services

Legal Investigations & Support

Criminal Defense Investigation
Civil Investigation (divorce/paternity, tort claims, trust/probate)
Trial Prep (exhibit building, witness coordination, subpoena service)
Trial Support (jury consultation, counsel table, sworn testimony)

Corporate Investigations

Internal Theft, Fraud, Embezzlement, Contract Violations
Executive Background Checks
Due Diligence & Risk Assessments

Family & Domestic Investigations

Infidelity & Marital Misconduct
Child Endangerment, Custody and Safety
Stalking, Harassment, Protective Order Violations
Bug Sweeps, Digital Privacy Violations

Skip Trace & Person Location

Subpoena and Process Service
Missing Persons Searches
Heir and Estranged Family Location

Ready To Talk

What We Do

Surveillance & Field Investigations

Comprehensive Background Reports

Legal Investigations & Jury Trial Support

Location & Process Services

Witness Interviews & Statement Gathering

Civil & Criminal Case Strategy Consulting

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“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

What Our Clients Say

    
 
 
         
   okcoplaw 
 
 
 
  Cullen Investigations did an amazing job for our firm.
  
 
        
   Jessica Lopez 
 
 
 
  Thank you, Eric Cullen and your team! Eric genuinely cares about every client and goes above and beyond. We are truly blessed to have him work on our loved one’s case. He is very trustworthy and makes you feel safe.
  
 
        
   Mary McMillen 
 
 
 
  Highly recommend Cullen Investigations!  Would give 10-stars if possible.  Eric and his team of investigators are easy to work with.  They are dedicated and fantastic at finding information.  I've worked with them on many cases (both simple and complex cases), and I've never been disappointed with their services.  Their office location is easily accessible and discreet, and they have never neglected to remain in contact with me by taking my calls immediately or returning my calls very quickly.
  
 
        
   Sharon Barron 
 
 
 
  I needed help with the security issue. I contacted Eric and the situation was resolved that afternoon. I would highly recommend him.
  
 
        
   Michael Bouziden 
 
 
 
  I have been working with Cullen Investigations for the last couple weeks and their service is nothing short of exceptional. 10 out of 10 recommend.
  
 
        
   Wade Stagner 
 
 
 
  I was referred to Cullen and associates to use his my Process Server, Mike Lowen, and his team within a couple of tries got service on my defendant, which I had been trying to do for the past five months and was unsuccessful. I highly recommend them! They were remarkable and went the extra mile for me. Absolutely amazing!
  
 
        
   Carolynn Bradley 
 
 
 
  Honestly I cannot say enough about these guys, both professionally and personally. I have worked with Eric and Mike for years now.  On a personal note, I have used them in a couple of cases near and dear to me with phenomenal results.  As far as professionally, I use them in any of the cases my firm has for process service and for investigations and I will never use anyone else.  They are the best.  If you're looking for top notch service and exceptional results look no further.  Cullen & Assoc. knows how to get the job done.  Side note: They are truly amazing people, too.
  
 
        
   Nino Brown 
 
 
 
  Eric Cullen has integrity, grit, determination. and a strong moral compass. His work with The Innocence Project is admirable and Tulsa is lucky to call him a citizen. Thank you for all of your hard work and everything you do for the families of wrongfully convicted criminals! Never stop!
  
 
  
 
  
 
   Google rating score: 4.8 of 5, based on 59 reviews

PRECISION. DISCRETION.
RESULTS.

22+ Years Of Experience

Why Choose Cullen Investigations?