Over 30 Years Investigating


Free Consultation  



Long Island Private Investigator 516-795-3368

Private Investigator Suffolk County

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

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 with unmatched investigative experience. We are a fully licensed, bonded and insured agency.

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 discreetly. At Long Island Investigations, your case is never subcontracted.

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

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, background checks, and all discreet and confidential issues.



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 agency.



With over 32 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 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!