About Us

Cookie Schwartz Diaz


Owner, CEO

Certified Fraud Specialist

See our video below.


Frank H. Diaz


Surveillance Specialist & Spanish Translator


Tri-Valley   Investigations is a full-service, licensed investigative agency based in   Southern California. Our staff consists of experienced and highly trained   investigators and process servers specializing in such areas as public record   and electronic database research, locating missing persons, identification of   assets, employment background investigations, personal injury claims,   undercover operations and surveillance.

Our clients consist of attorneys, individuals, business   professionals, insurance companies, corporations and other private   investigators. Tri-Valley’s goal is to provide complete and confidential   customer satisfaction utilizing the most cost effective and expeditious   methods available to us. We provide comprehensive and professionally written   reports. Our clients will attest to our dedication and outstanding results.

Our headquarters are located in beautiful northern Los   Angeles County. We have access to billions of records nationwide and a   network of carefully cultivated sources allowing us to provide thorough   investigations for our clients on a local, national or international level.

Cookie Schwartz, the founder of Tri-Valley Investigations,   is a licensed private investigator, No. PI 18825, as well as a Certified   Fraud Specialist. She has extensive experience and training in all types of   investigations and carefully supervises each and every assignment. Prior to   doing investigative work, Cookie had a background as a legal assistant to   numerous attorneys as well as years of working within governmental agencies.

Our years of experience and high degree of professionalism   enable us to provide you with a thorough, informative solution to all your   investigative needs.



Check out our video published in 2009.