Executive Profile
MARC A. GARZA
Founder and CEO
Licensed Private Investigator
Retired Police Sergeant
Marc A. Garza is the Founder and CEO of GRI Investigative Group, Inc., a California-based investigative firm providing litigation support, corporate investigations, workplace misconduct investigations, and complex fact-finding services to law firms, corporations, government agencies, and private clients.
With more than 30 years of combined law enforcement and investigative experience, Mr. Garza has conducted and supervised investigations involving fraud, workplace misconduct, criminal defense, civil litigation, wrongful death, and corporate matters. He has testified in both California State and Federal Courts and is recognized for delivering thorough, objective, and court-defensible investigative work.
Prior to founding GRI Investigative Group, Mr. Garza served over two decades in law enforcement retiring at the rank of Police Sergeant. Today, he leads a team of experienced investigators dedicated to providing professional, discreet, and results-driven investigative services throughout California.
Professional Qualifications
• 30+ Years Combined Investigative Experience
• Founder & CEO, GRI Investigative Group, Inc.
• Licensed California Private Investigator #28059
• State & Federal Court Testimony Experience
• Civil & Criminal Litigation Investigator
• Corporate & Workplace Investigator
• Witness Interview & Statement Specialist
• SWAT & Firearms Trainer
• Field Training Officer (FTO)
JOHN S. MUNOZ
Senior Investigator
Licensed Private Investigator
John S. Muñoz is a seasoned investigator specializing in complex investigations, surveillance operations, and missing persons cases. He works closely with attorneys to develop evidence, locate critical witnesses, and conduct investigations that support civil, criminal, and family law litigation.
Mr. Muñoz has extensive experience conducting covert surveillance, skip tracing, witness locates and interviews, and difficult missing person investigations. He is skilled at managing challenging assignments involving evasive subjects, fraud allegations, and other matters requiring discretion, persistence, and strategic investigative planning.
Known for his professionalism and attention to detail, Mr. Muñoz provides thorough investigative reports and well-documented evidence to assist attorneys in preparing and strengthening their cases.
Professional Qualifications
• 10 +Years Combined Investigative Experience
• Licensed CA. Private Investigator #189232
• State & Federal Court Testimony Experience
• Security Specialist