"Leadership. Integrity. Proven Results."
GRI Investigative Group began as a small, dedicated private investigations agency with a simple mission: to provide ethical, results-driven investigative services rooted in integrity and experience. What started as a humble operation has grown into a trusted resource for attorneys, corporations, and private clients across California. Today, GRI is known for its professionalism, discretion, and commitment to uncovering the truth—one case at a time.
Marc A. Garza, P.I.
President & CEO of GRI Investigative Group, Inc.
Background and Experience:
Marc is a licensed private investigator (CA PI #28059) and the CEO of GRI Investigative Group, Inc. A retired police sergeant with over two decades of law enforcement experience, Marc brings a proven background in both public service and private sector investigations. He has testified in both civil and felony-level criminal cases, earning a strong reputation for professionalism, and credibility to his work product. Today, Marc specializes in civil litigation, criminal defense, and family law matters. He leads a team of highly skilled investigators, ensuring each case is handled with discretion, and results-driven focus. As CEO, he remains closely involved in all aspects of the firm’s work, dedicated to providing exceptional service to law firms, corporations, and private clients. Marc is an active member of the California Association of Licensed Investigators ("CALI"), the San Diego County Bar Association ("SDCBA"), and Business Networking International ("BNI").
Stella Chases
Operations - GRI Investigative Group, Inc.
Background and Experience:
Ms. Chases brings a wealth of experience in office management and operational systems, with a focus on enhancing the efficiency of investigative and surveillance teams. At GRI Investigative Group, Inc., she plays a pivotal role in supporting complex investigations by conducting detailed investigative research, organizing case documentation, and delivering precise, discreet litigation support. Known for her professionalism, organization, and strong attention to detail, Stella ensures that daily operations run smoothly and that every case receives the thorough support it deserves. She holds a degree in Criminal Justice from San Diego State University, where she developed a deep passion for the field—a passion that continues to drive her commitment to excellence in every aspect of her work with our agency.