We help people get answers. 

Contact us today to discuss your case.

About Landmark investigations

Landmark Investigations is a full-service investigation agency headquartered in Corona Del Mar, CA.  We have a 15-year track record of delivering first-class investigative results.  We serve attorneys, businesses, insurance companies, and private clients.

Landmark Investigations is owned and operated by Tom Graybill.  Tom is a licensed private investigator, a licensed insurance adjuster, a registered process server, and a forensic accountant.  Tom is also the Orange County District Governor for the California Association of Licensed Investigators (CALI).

Landmark Investigations specializes in background checks, surveillance, financial investigations, insurance claim investigations, and difficult process service.

Whether you are an individual who has never used the services of a private investigator, or someone in the law, insurance, or the business community, we provide both a personal and professional touch that insures your needs are being served.

We have successfully helped thousands of clients get the answers they need.  You may think your request is unusual, or you might even be a bit reluctant to even discuss it with a stranger, rest assured we have heard everything in the book and your confidentiality will be protected at all times.

why choose us ?


We are highly competent in all areas of investigations and consistently deliver superior results for our clients.


We have over 15 years of experience as an investigator working domestic, corporate, and litigation support cases.


We are highly skilled investigators who have the training and resources needed to perform quality investigations.


We are available anytime to assist with your case. We provide timely reports so you have the most current information.

Our Services

Our Expertise

Domestic & Family Law Investigations​

Our investigators are experts in all forms of investigations, whether that be cheating spouses, child custody, or general surveillance.​

Corporate & Insurance Investigations

Businesses require a unique skill set for their investigations, our investigators are the key resource you need to protect your business.​

Criminal & Civil Investigations

The expertise and experience we bring to the table wins cases for you. Our research services are uniquely tailored to the legal community.​

WORK With A Professional Investigator

we are here to help

Contact us today to discuss your case.

We get results for our clients.

Professional Investigations

In order to provide you with the best service, our team has been trained and equipped with the latest investigative tools and resources.


Your privacy is very important to us, we will not discuss any information about your case with anyone except you. We guarantee it.

Talk To An
Expert Today

Speak with a member of our professional investigations team for free. We can help, request a free consultation now.


We will not take your case unless we are confident we can provide the services you desire. Once we take your case we will conduct the investigation in a time efficient and professional manner, always keeping your satisfaction as our goal. At the conclusion we will deliver a concise and well written report in a timely manner. Most of all we will follow up to be sure that you are satisfied with the service provided.

We look forward to the opportunity to discuss your project. We know investigative matters often involve highly charged, private situations that require the utmost discretion. We are sensitive to this and know how to minimize the stress in handling matters of a delicate nature. Call or e-mail and we’ll give you the information you need to make a decision that will lead you to the peace of mind you are looking for.


We provide investigative services to all of Southern California:

Corporate Headquarters:
2744 E. Coast Highway, Suite 7
Corona Del Mar, CA 92625

Direct: (949) 662-5080
Email: tom@landmarkinvestigations.com

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