"Leadership and Experience that matters."
GRI Investigative Group, Inc., was founded in 2019 by Marc A. Garza with decades of experience in law enforcement and investigations. Based in San Diego, California, we provide comprehensive and reliable investigative services. GRI is committed to delivering meticulous case analysis, uncovering critical evidence, and assisting clients in navigating complex legal challenges with expertise and integrity. GRI is the go-to resource for law firms, corporations and private clients seeking a dependable ally in achieving successful outcomes in court and private sector environments.
- Criminal Defense Investigations
- Civil & Family Law Matters
- Corporate Investigations
- TSCM Bug Sweeps/Inspections
- Covert Surveillance Operations
- Post-Conviction Investigations
- Missing Persons Investigations
- Certified Firearms Instruction
Marc A. Garza, P.I.
Founder & CEO of GRI Investigative Group, Inc.
Background and Experience:
Marc is a licensed private investigator and CEO of GRI Investigative Group, Inc., a San Diego-based private investigations agency specializing in criminal defense, civil litigation, and high-technology surveillance operations. With over 30 years of law enforcement, investigative, and consulting experience, Marc is a trusted authority in uncovering the truth and delivering actionable results for his clients.
Before founding GRI Investigative Group, he spent over two decades in law enforcement, retiring at the rank of police sergeant in 2019. His law enforcement experience included assignments in area patrol, field training (FTO), investigations, SWAT officer, tactical firearms training, and police supervision. He is a respected trainer in the tactical response and mitigation of active shooter and terrorist events.
Marc’s comprehensive investigative skills have been utilized by law firms in both state and federal courts, where he has testified in criminal, civil, and family law cases. His expertise extends to felony-level criminal defense cases involving homicides, gang-related violence, and assault with a deadly weapon (ADW).
As CEO of GRI Investigative Group, Marc leads a team of investigative professionals dedicated to providing meticulous and ethical investigative services. His leadership and strategic vision have positioned the agency as a trusted partner for attorneys, businesses, and individuals seeking thorough and reliable investigative solutions.
In his spare time, Marc is deeply committed to pursuing justice through his work with The Innocence Center in San Diego. He assists with post-conviction investigations, applying his extensive experience in law enforcement and private investigations to uncover new evidence and identify potential wrongful convictions.