Over 20 years of Investigative Expertise!

Corinthian Group: Preeminent Private Investigators in California

California’s Premier Private Detective Agency. An invaluable source of information for those considering hiring a private investigation agency.

The Corinthian Group Difference!

We welcome you to our website! Our goal during your visit is to provide a source of knowledge and insight into the personal attributes needed for successful investigations! We want to set the bar for the private investigative industry while educating the public and perspective clients. Not all investigations and private detective agencies are the same!

While there are plenty of private investigation agency websites that may attract your attention via click bait, Corinthian Group private investigator prime objective is to distinguish ourselves between those private investigator agencies that pay for Ad space to reach perspective clients versus educating the public on best practices when selecting a private detective agency.

While there are plenty of private investigation agency websites that may attract your attention via click bait, Corinthian Group private investigator prime objective is to distinguish ourselves between those private investigator agencies that pay for Ad space to reach perspective clients versus educating the public on best practices when selecting a private detective agency.

Corinthian Group understands that your case needs to be handle correctly the 1st time, conducted in a cost-efficient manner while yielding superior results.

Apart of Corinthian Group’s Mission Statement is to transform the investigative experience shared by our clients through the training, vetting and management of our investigator teams. Our private investigators are the Rock Stars and backbone of our continued success through the past two decades. It is essential that our private investigators emulate the passion for investigations, relentless pursuit for perfection and diligence in the profession as exemplified by Corinthian Group’s founders.Corinthian Group is a family! We have a 100% retention rate which means that there is high level consistency regardless of which investigator is assigned to your case! We invest in our private detectives so that you can feel confident when investing in US!!!

We have over 20 years of experience in providing exceptional legal services to individuals, businesses and law firms offering a range of services in the areas of insurance fraud investigations, child custody / family law investigations, workplace investigations, infidelity investigations, infidelity investigations and criminal defense investigations.

Our Services

Insurance Fraud

Tired of paying for unproductive surveillances yielding no
results?

Workplace/Employee Malfeasance

Employee liabilities hurting business productivity?

Child Custody & Support

Concerned about your child’s well being while with their other parent?

Infidelity

Is an unfaithful spouse or significant other taking you for granted?

Drones / Aerial Surveillance

Do you need hard to obtain intel and or a spectacular shot?

Criminal Defense INVESTIGATIONS

Uncovering the TRUTH in pursuit of reasonable doubt. 

“KNOWLEDGE IS POWER”

Do you need to hire a Private Investigator NOW?

To learn more about hiring a Private Investigator.

Why should you hire Corinthian Group’s Private Investigators?

Informational Videos

~ Client Testimonials ~

My family and I are truly grateful! 

Claude’s expertise and professionalism are outstanding. If you require investigative services by a true expert, I highly recommend Claude. His attention to detail, excellent communication skills, and integrity to his clients make him stand above the rest!  Claude, your dedication and continued support are attributes of your professionalism!

My family and I are truly grateful!

Vickie Thompson

ACI / Pro Per Client

Attentive and eager to help!

He was very quick in responding, professional, attentive and eager to help with my situation.

Shai - Shay

Client from Thumbtack

Very informative and knowledgeable!

Claude is very informative and knowledgeable about the steps I need to take in how to go about a current situation. I really appreciated his advice and I feel confident about what I need to do next. He is very kind and answered all my questions, thank you for your professional help and guidance. If you are unsure about something like I was, talk to Claude he will do the best he can to help you.

Natalie B.

Client from Thumbtack

My attorney had a field day!

Going through with my divorce was a walk in the park. The evidence of unbecoming behavior that I accumulated courtesy of Corinthian Group’s surveillance investigators was enough to make my case in court and my attorney had a field day. Thanks guys for helping save my life.

Sandrila Jones

Divorcee

Exceeding each and every expectation!

During my career as an attorney, I would have need for a trusted, competent, reasonable, fair-priced, creative, and ethical private investigator. Claude Ammons has been that man.

K.B. Jones

Attorney Kevin Brian Jones

Judge / Judicial Officer / Attorney

Within weeks our theft issues had disappeared!

Our company was incurring loss due to employee theft and Claude was hired to help detect how the loss was occurring and implement a solution. Within weeks our theft issues had disappeared and we have suffered no further loss. Claude was professional, diligent and offered a variety of solutions to our company while maintaining a high degree of integrity. I would recommend his services to others with similar problems.”

Doug Binford

Millard Refrigerated Services - VP

Quick Links

  • Family Law Investigations
  • Cohabitation Investigations
  • Child Custody Investigations
  • Infidelity Investigations
  • Surveillance
  • Criminal Defense
  • Investigations
  • Background Checks
  • Skip Tracing

Contact Info

CORINTHIAN GROUP

3175 Sedona Court, Ontario, California 91764, United States

California PI License # 26978

FAA 107 License # 4374346

Toll Free (877) 687-3939

Locally at (909) 931-3595

Working Hours

Office Open: Monday - Friday
Office Hours: 9:00 am to 4:30 pm
Lunch Hours: 12:00 pm to 1:00 pm