We are available 24 hours per day – 365 days of year. Call today to schedule your free consultation.


(949) 662-5080

Our Practice Areas

Our clients trust us to solve their most complex cases


We utilize cutting-edge technology and surveillance equipment to provide stellar investigative services including skip traces, background checks, locating persons of interest, surveillance, pre-employment screening, and asset checks. We specialize in personal injury and wrongful death cases involving catastrophic injuries from trucking, auto, and product liability accidents.


This is our firm's specialty, we are surveillance experts. Surveillance is our specialty. Tom was born and raised in Los Angeles and knows the area better than anyone. We use the highest quality surveillance equipment to ensure superior results. We also make our own surveillance equipment and have various types of cameras we use in the field depending on the nature of the case.

process servers

Let us serve your civil and criminal documents and service of process. We can locate your subject and effectuate service. We serve Los Angeles, Orange, San Bernardino, Riverside, and Ventura Counties. We specialize in difficult serves, stake outs, and same-day process service.

Attorney Services

We assist law firms all over the country every month with cases ranging from personal injury, to divorce, wrongful death and criminal litigation. We have assisted top lawyers in the state of California. We provide lawyers with peace of mind so that every case runs smoothly.

Insurance CLAIMs

We provide insurance claims investigative services including sub-rosa activity checks, surveillance, background checks, asset checks, medical clinic inspection and medical document retrieval. We assist insurance adjusters; Special Investigations Units and defense firms to gather the information necessary to make informed claims 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 settlement analysis, insurance settlement analysis, business partner dispute resolution, and auditing internal processes and financial controls 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, especially in catastrophic personal injury and wrongful death cases, or litigation involving substantial economic loss and damages. Over my 15+ years of experience as a licensed private investigator, licensed independent insurance adjuster, registered process server, and forensic accountant I have successfully handled thousands of high profile investigations in California.  I was born and raised in Los Angeles, so I know the area and culture 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

It is the mission of Landmark Investigations:


  • 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, and records retrieval; insurance claims management & investigations. No matter how large or complex the job 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 litigation support services 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, law firms with all of their process serving, attorney services and full scale investigations. We also provide private parties with surveillance and infidelity investigations. We pride ourselves on treating every case with 15 plus years of experience under our belt, and being sensitive to every client’s needs.

Our Investigative Services

We offer a wide range of investigative services



landmark investigations - home page - investigative services - background checks

Background Checks

forensic accounting

witness interviews

records procurement

document retrieval

landmark investigations - home page - investigative services - scene investigations

scene investigations

undercover operations

landmark investigations - home page - investigative services - liability assessment

insurance claims

Why Choose Our Firm

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

LICENSED private investigators

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

LICENSED Independent insurance adjusters

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 get superior video and photographs  

landmark investigations - home page - recent surveillance investigations - infidelity - cheating spouse

INFIDELITY surveillance

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

landmark investigations - home page - recent surveillance investigations - Workers' Comp

Workers' comp Surveillance

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

landmark investigations - home page - recent surveillance investigations - child custody

Child custody Surveillance

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

landmark investigations - home page - recent surveillance investigations - divorce

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 doing yard work and car maintenance.

landmark investigations - home page - recent surveillance investigations - personal injury

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.

landmark investigations - home page - recent investigations - forensic accounting

Forensic accounting to settle business dispute

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

landmark investigations - home page - recent investigations - dna paternity testing


Conducted paternity investigation to confirm father of baby.

landmark investigations - home page - recent investigations - business competitor intelligence


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

landmark investigations - home page - recent investigations - forensic accounting2

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.

landmark investigations - home page - recent investigations - litigation support

Litigation support for criminal JUry trial

We assisted defendant's counsel in securing background information on co-defendants and witnesses.

landmark investigations - home page - recent investigations - expert witness

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 provide service to all of southern California.

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

Close Menu