Over 30 Years Investigating


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Long Island Private Investigator 516-795-3368

Private Investigator Suffolk County

We are a full service private investigator and New York City private investigator and detective agency, based in Massapequa within Nassau County and Farmingdale in Suffolk County. Our investigative, detective and security services are available throughout New York and include Nassau County and Suffolk County as well as New York City.

Private Investigator Long Island

Long Island Private Investigator

All cases are performed by our professional, experienced staff, consisting of former New York City Police Department Detectives, Nassau County and Suffolk County police Detectives with unmatched investigative experience. We are a fully licensed, bonded and insured agency, Long Island based. Your case is never subcontracted.

Serving  Nassau County & Suffolk County, NY

Private Investigator Suffolk County ny

The goal of L.I. Investigations, is to perform these investigative services diligently, accurately, and when necessary, discreetly. LI Investigations. Inc., a private investigator agency, Suffolk County, Nassau County, New York.

Investigative Services at a glance...

Private Investigator Long Island

Click on our services page for details

  • Surveillance
  • Private Security
  • Computer Forensics
  • Matrimonial
  • Infidelity
  • Child Custody 
  • Lawsuits
  • Criminal Defense
  • Assets Located

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L I Investigations, Inc., a Long Island Private Investigator serving New York City, Nassau County and Suffolk County

Call today for a free consultation:

Suffolk County Private Investigator516-795-3368

100% confidential


             Long Island Investigations, Inc.
Serving  Nassau County, Suffolk County and New York City


We specialize in working with each client individually through personal type cases pertaining to divorce, infidelity, cheating spouse or partner, child custody, Motor Vehicle and Driver's License checks, background checks, National asset locating, security, and all discreet and confidential issues. We serve as a private investigator in Nassau County, NY and Suffolk County, NY as well as New York City, Queens and Bronx County.



Our agency is dedicated to helping you with your unique and special needs. We understand the sensitivity of your case as well as the need for confidentiality. Click on our Services link to view some of the investigative services we offer. Or go to our History page to read about the qualifications and experience of our private investigator and detective agency.


Your Needs

No matter what your needs, we are the agency that can help. We offer a full range of services at cost-effective rates within Nassau County and Suffolk County NY, as well as all five boroughs of New York City.



With over 30 years of conducting all aspects of investigations, you will not find a more capable, dedicated, knowledgeable, seasoned and compassionate agency. All investigators are former NYPD Detectives. See our History page for the qualifications of the president and lead investigator, Paul Massimillo.



Private Investigator Long Island

Private Investigator Nassau County Private Investigator Suffolk County

Licensed Bonded Insured

Serving Nassau County NY and Suffolk County NY as well as the five boroughs of New York City.

Licensed by the New York State Department Of State, Dept. of Licensing Services

Home Services History Infidelity Contact

Matrimonial Surveillance Long Island Insurence fraud Long Island Workers Comp Fraud Private Investigator Long Island Long Island Private Investigator Surveillance Specialist Long Island Investigator Private Investigator Suffolk County

Experience Is Our Strength!