We are available 24 hours per day – 365 days a year.  Contact us today to schedule your free consultation.


(949) 662-5080

full-service investigation agency for:
attorneys, insurance companies, businesses, and private clients

Our Practice Areas

Our clients trust us to solve their most complex and challenging cases.


We utilize cutting-edge technology and surveillance equipment to obtain superior results for our clients. Our investigative services include surveillance, skip traces, background checks, locating persons of interest, pre-employment screening, and asset checks. We specialize in cases involving personal injury, wrongful death, emotional distress, divorce, and workplace accidents.

Surveillance EXPERTS

Surveillance is our firm's specialty, we are surveillance experts. Tom was born and raised in Los Angeles and knows the area better than anyone. We use high-quality surveillance equipment to obtain superior results for our clients. Since each case is unique, we utilize various types of surveillance equipment to ensure client satisfaction.

process servers

We are Registered Process Servers. Let us serve your legal documents. We provide peace of mind when it comes to difficult serves. We can locate your subject and effectuate service. We specialize in same-day process service, difficult serves, rush serves, and stake-outs. We serve Los Angeles, Orange, San Bernardino, Riverside, and Ventura Counties.

LEGAL & Attorney Services

We assist law firms all over California with criminal, civil, divorce, and probate cases. We have assisted California's top lawyers in winning cases and securing favorable judgments for their clients. We provide lawyers with the confidence they need to ensure every case runs smoothly.


We provide claims adjusting and investigative services including sub-rosa, activity checks, surveillance, background checks, asset checks, and medical document retrieval. We assist insurance adjusters, Special Investigations Units, and their defense attorneys with gathering the information necessary to make informed decisions.

Forensic Accounting

Tom earned his MBA (Emphasis in Finance) from Pepperdine University. He is an expert when it comes to investigating financial matters, including divorce settlements, insurance settlements, business partner disputes, and auditing internal processes. He is also an expert at auditing financial controls in order to identify fraudulent activity.

Hello, I'm Tom

“Thank you for visiting my site, I am the owner of Landmark Investigations.  Today’s courtrooms demand professional investigators with legal, insurance, and financial expertise.  This is true especially in cases involving catastrophic personal injury, wrongful death, divorce, or any other litigation involving substantial economic damages. 

Over my 15+ years of experience as a private investigator, independent insurance adjuster, registered process server, and financial analyst, I have successfully handled thousands of high-profile investigations in California.  In addition, I was born and raised in Los Angeles, so I know the area better than anyone else.  

It is important to have an experienced and accomplished investigator on your team.  I pride myself on going above and beyond for my clients, and being available 24/7 to provide assistance.  I have accumulated many satisfied clients and I continue to raise the bar in terms of quality and success.  I am confident that I will be able to assist with your case.  Contact me today and I will get you the information you need.”  

landmark investigations - home page - tom graybill profile photo
Tom Graybill, MBA, CEO

My Professional Qualifications

I am uniquely qualified to handle your most important investigations.

Licensed Private InvestigatOR

licensed independent Insurance ADJUSTER



we are california's best surveillance investigators

Our Mission

The mission of Landmark Investigations is:

  • To find solutions for our clients by providing factual, relevant and timely information using innovative research and investigative techniques.
  • To provide uncompromising service and to utilize resources and technology to find newer and faster ways to meet our client’s needs.
  • To provide our clients with a level of satisfaction that always surpasses their expectations.

Landmark Investigations provides a wide range of litigation support services from service of process, full scale investigations, attorney services, records retrieval, insurance claims management & investigations. No matter how large or complex the case is, Landmark Investigations can get it done first, and more importantly, get it done right.

  •  We find solutions for our clients by providing factual, relevant and timely information through innovative investigation research.
  • We provide uncompromising attorney services and utilize current  technology to find newer and faster ways to meet our client’s needs.
  • We provide our clients with a level of satisfaction that always surpasses their expectations.
  • If we don’t locate your person of interest, you don’t pay.
  • If you are not 100% satisfied with our performance, you don’t pay.

Landmark Investigations has the capabilities to assist insurance companies and defense counsel with all of their claims investigations.  We also assist law firms with their investigations, process service, and locates. We also provide private parties with surveillance for infidelity investigations. We pride ourselves on doing great work, and being sensitive to our client’s needs.

Our Investigative Services

We offer a wide range of investigative services



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Background Checks

forensic accounting

witness interviews

records procurement

document retrieval

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scene investigations

undercover operations

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Why Choose Our Firm

We are an experienced, full-service detective agency specializing in private investigations, financial investigations and insurance claim investigations.  We are dedicated to helping our clients get the information they need in order to resolve their case.

LICENSED private investigators

We are licensed private investigators. We specialize in surveillance, background checks, and undercover operations.


We are licensed independent insurance adjusters. We specialize in witness interviews, scene investigations, and intelligence gathering.

registered process servers

We are registered process servers. We specialize in situations where the defendant or witness is evading service.

EXPERIENCED forensic accountantS

Tom has his MBA with an emphasis in Finance from Pepperdine University. He is an expert at forensic accounting and financial analysis.

15+ Years of investigative experience

We have over 15 years of experience investigating insurance claims, financial discrepancies, and domestic issues such as marital infidelity and child custody.

Excellent customer service

We go above and beyond for our clients. We pride ourselves on being available 24/7 to help our clients.

Recent Surveillance Investigations

We use state-of-the art surveillance equipment to obtain superior results.  

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INFIDELITY surveillance

Caught husband kissing his girlfriend in the Home Depot parking lot.

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Workers' comp Surveillance

Employee claiming serious ankle injury was caught working out on stair climber.

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Child custody Surveillance

Alcoholic mother going through divorce was caught getting drunk in front of children.

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Divorce Surveillance

Followed client's ex-husband from work and located his new residence for process service.

INFIDELITY surveillance

Cheating husband caught drinking with his girlfriend at a bar while on a work trip.

child custody surveillance

Child Custody Surveillance

Alcoholic father going through divorce caught getting drunk and driving with his son.

workers' compensation investigation

WORKERS' Comp Surveillance

Employee claiming serious injury to lower back caught performing yard work and car maintenance.

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Personal Injury Surveillance

Motorist claiming serious back injury from car accident is caught coaching son's soccer game.

Recent Investigations

We provide assistance on a wide variety of cases.  Below are some our recent investigations.

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Forensic accounting to settle business dispute

Performed financial audit of equity draw to settle a dispute between business partners.

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Conducted paternity investigation to confirm father of baby.

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We investigated the CEO of a business competitor to confirm recent allegations of illegal drug use.

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Forensic accounting for divorce settlement

We audited ex-husband's financial statements in order to confirm a fair divorce settlement.

employee Background check

We performed a comprehensive background check on a company's new hires.

Business competitor intelligence

Monitor shipments to ensure no products were being delivered to the competitor's warehouse.

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Litigation support for criminal JUry trial

We assisted defense counsel with securing background information on co-defendants and witnesses.

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EXpert witness testimony

We testified in court regarding video we had obtained neglectful parenting in a child custody case.


Our Coverage Area

Our main office is in Huntington Beach.  We proudly serve all of southern California and beyond.

Los Angeles

  • Santa Monica
  • Glendale
  • Santa Clarita
  • Beverly Hills
  • Palos Verdes
  • Calabasas
  • Encino
  • Malibu


  • Huntington Beach (Main Office)
  • Newport Beach
  • Santa Ana
  • Irvine
  • Garden Grove
  • Anaheim
  • Costa Mesa
  • Fullerton


  • La Jolla
  • Point Loma
  • Rancho Santa Fe
  • Oceanside
  • Imperial Beach
  • Chula Vista
  • Poway
  • El Cajon


  • Riverside
  • San Bernardino
  • Corona
  • Canyon Lake
  • Rancho Mirage
  • Temecula
  • Indian Wells
  • Palm Springs


  • Thousand Oaks
  • Santa Paula
  • Simi Valley
  • Camarillo
  • Moorpark
  • Oxnard
  • Fillmore
  • Oak Park

Contact Us

Contact us today for a free case evaluation



419 Main Street, Suite 215

Huntington Beach CA 92648

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