Licensed Private Investigations - CA. PI. #28059                               (888) 519-0555


Legal Investigations • Investigative Research • Litigation Support  

GRI INVESTIGATIONS (GRI) is a California licensed private investigations agency specializing in civil, legal and family law investigations. We are a leading provider of investigative and research services for law firms, corporations and insurance companies. We have a team of qualified investigators with an expertise in locating actionable evidence and information for our clients in a discreet and confidential manner. Our investigators have extensive training and experience in a variety of investigative areas, which enables us to complete concise and comprehensive investigations. Part of this process includes educating our clients about investigative protocols and discussing potential obstacles in obtaining a proper evidence-based investigation. Our main goal and objective is to conduct unbiased and impartial investigations by utilizing fact-finding methods that assist our clients in making proper legal and business decisions. Please note that we don't take on all investigative requests unless we feel we can deliver a precise work product. Call (888) 519-0555 to speak with one of our licensed investigators to discuss your case goals and objectives. All calls are considered privileged and/or confidential communications.

Investigative Services:

  • Civil & Legal Investigations
  • Family Law  Investigations
  • Criminal Defense Investigations
  • Personal Injury Investigations
  • Corporate & Business Investigations
  • Internal Workplace Investigations
  • Surveillance & Covert Investigations
  • Security Consulting & Safety Training

     Member of the California Association of Licensed Investigators (CALI)

Litigation Support Services:

  • Background/Criminal Checks & Due-Diligence Investigations
  • Witness Locates; Interviews and Documentation
  • Scene Investigations; Photographic & Video Documentation
  • Cohabitation Investigations per CA. Fam. Code 4323 (a) (1)
  • Child Visitation; Custody Welfare & Activity Checks
  • Service of Process; Evasive and Difficult Serves
  • Evidence Collection and Preservation
  • Social Media & Internet Investigations

       Member of the Professional Investigators of California (PICA)

 Member of the California Defense Investigators Association (CDIA)


Leadership and Experience that matters.....

" I am honored to be regarded as an investigative resource for my clients.  I know first hand the level of expertise that's required to conduct a comprehensive investigation. If you are seeking a higher level of  personal attention, please contact us to discuss your case. I look forward to working closely with you to meet your investigative goals and objectives."

-Marc A. Garza, Owner & CEO


Marc is the owner and CEO of GRI Investigations (GRI). He is a licensed private investigator and a retired law enforcement officer with over 20 years of service in Southern California. He specializes in civil, legal and family law investigations for law firms, corporations and private clients.  He has assisted legal counsel with investigations and research in numerous family law, civil litigation & felony defense cases filed in the Superior Court of California, U.S. District Court and U.S. Immigration Court.  He has testified in court proceedings on investigaitve issues, in both civil and criminal cases. He is a member of the California Association of Licensed Investigators (CALI) , the Professional Investigators Association of California (PICA) and the California Defense Investigators Association (CDIA). He is licensed & insured by the California Bureau of Security and Investigative Services (BSIS) under Licenses #PI28059, #TIF2591 & #G6465645.  

During his tenure as a sworn law enforcement officer, he held assignments in patrol, firearms training, SWAT, investigations, police field training and police supervision.  In 2010, he was selected by CAL-EMA (now CAL OES), to train law enforcement personnel throughout the State of California in the tactical response and rapid deployment for active shooter events. He developed his extensive investigative knowledge and experience from conducting public sector, criminal and internal affairs investigations. In addition, he received thousands of hours of  specialized investigative and legal training from federal, state and municipal agencies, such as the FBI and the California Peace Officer Standards & Training (CA. POST).

Marc's attention to detail, and experience with complex investigations, offers his clients a unique set of professional skills and work product. His main goal is to build long-term business relationships with clients by taking a collaborative, transparent approach to all investigations. Part of this process includes obtaining actionable evidence for his client's legal cases in a discreet, impartial and confidential manner.  


"What clients are saying...."

"We are extremely pleased with Marc & his company's efforts on our case. Their work product is excellent. I would highly recommend Marc for anyone needing his expertise." 

Katharine Tremblay Beck
Tremblay Beck Law

"Mr. Garza is a professional , experienced and efficient private investigator. I have used his services on many of my cases. I highly recommend his investigative services"

Jose Orozco
Orozco Law Firm, APC

"Whether our office has a civil dispute, divorce case or immigration matter, GRI is the first call we make when we need information or evidence that's difficult to obtain."

Ed Perez
Law Offices of Ed Perez. PLLC

"I always send my clients to GRI. Marc is always very responsive. He has helped many of my clients out. I would highly recommend his investigative


Laura Talamantes
Talamantes Law Firm, APC


For more information about our services please fill out the contact form below and your inquiry will be answered promptly. You may also call (888) 519-0555 for further information. All calls are confidential.


CA. BSIS 28059



Venture Commerce Center

2566 Catamaran Way, Suite #54

Chula Vista, California 91914



P.O. Box 212967

Chula Vista, CA 91921

(888) 519-0555

Copyright © 2020  GRI Investigations - All Rights Reserved.  

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