FatguyPI
You Can't Hide From The Fat Guy
Philadelphia's most trusted Licensed Private Investigator — delivering admissible results since 1990.
Investigation Services
Licensed, certified, and relentless. Every service we provide meets the highest standards of legal compliance and professional ethics.
Surveillance Operations
Covert mobile and stationary surveillance with HD video documentation. Whether you need evidence of infidelity, workers' compensation fraud, or child custody violations — we deliver legally admissible footage.
Surveillance Operations
Mobile Surveillance · Stationary Stakeouts · HD Video Evidence · 24/7 Operations
Background Investigations
Criminal Records · Financial History · Employment Verification · Social Media Analysis
National Person Locates
Nationwide Search · Skip Tracing · Asset Location · Address Verification
Process Serving
Legal Document Service · Evasive Subject Service · Rush Service Available · Affidavit of Service
Licensed PI · 36+ years of experience · Natural Born Private Investigator
Three Decades.
Zero Compromises.
Gary DeFinis is a natural born private investigator with an investigative tradition dating back to 1990. He founded Philadelphia Surveillance Company in August 1997 on one principle: every client deserves the truth, delivered professionally, confidentially, and ethically.
With over 15,000 cases closed across Pennsylvania, New Jersey, and Delaware — Gary brings three decades of street-level instinct, legal expertise, and relentless determination to every investigation. No military background. No law enforcement career. Just a natural born investigator who's been doing this longer than most.
Two Brands. One Team. Same First-Class Service.
FatguyPI & Philadelphia Surveillance Company — same licensed investigator, same relentless results.
Investigative career begins — natural born investigator
Philadelphia Surveillance Company officially founded
Expanded to statewide operations across PA
Certified NCISS national investigator
Launched digital intelligence & OSINT division
Over 15,000 successfully closed cases
MilestoneStill active. Still relentless. Still closing cases every day.
FatguyPI brand launched — same trusted service, bold new identity
Active NowPennsylvania Association of Licensed Investigators
National Council of Investigation & Security Services
Licensed Private Investigator — Commonwealth of PA
Investigative Tradition — 36+ Years of Successful Cases
Closed Cases.
Proven Results.
A selection of representative cases — all details anonymized to protect our clients' confidentiality.
Executive Fraud Uncovered
Conducted a 6-week covert investigation revealing a senior executive\'s embezzlement scheme. Delivered forensic-grade documentation that resulted in criminal prosecution.
Child Custody Case Won
Documented 30 hours of footage over two weeks proving parental neglect and substance abuse, directly contributing to a favorable custody ruling for our client.
Executive Background Screening
Uncovered undisclosed criminal history and fraudulent academic credentials in a C-suite candidate, protecting our client from a potentially catastrophic hire.
Workers Comp Fraud Exposed
Surveillance over three weeks revealed a claimant performing physically demanding activities while collecting full disability benefits, saving our client $340,000.
Person Located Nationwide
Using advanced OSINT techniques and field investigation, located a missing individual who had deliberately assumed a new identity across three state lines within 11 days.
Evasive Subject Served
After four failed attempts by other agencies, our team successfully served critical legal documents to a highly evasive subject avoiding legal proceedings for 8 months.
Every case is unique. Let's discuss yours.
Trusted by Attorneys,
Corporations & Families
Our clients can't always go public, but their results speak for themselves.
“I have worked with many investigators over my 20-year career. Philadelphia LPI is hands-down the most thorough and reliable firm in the region. My clients trust them completely.”
“They recovered critical evidence in 72 hours that our attorneys couldn't find in six months. Philadelphia LPI operates with absolute professionalism and discretion.”
“I have worked with many investigators over my 20-year career. Philadelphia LPI is hands-down the most thorough and reliable firm in the region. My clients trust them completely.”
“Their surveillance documentation was so thorough and legally airtight, our case was resolved in our favor before it even reached the courtroom. Exceptional value.”
“The background investigation revealed information that our standard HR checks completely missed. We now use Philadelphia LPI for all executive-level hires.”
“I refer all my clients requiring surveillance to Gary and his team. Their evidence is always court-admissible, their methods legal, and their turnaround remarkable.”
“During the most difficult time of my life, this team was not only professional but genuinely compassionate. They found the answers I needed to move forward.”
Every Hour Matters.
The sooner we start, the better your outcome. Get a completely free, no-obligation consultation with a licensed investigator today.
Confidential
Consultations
Available.
All inquiries are handled with strict confidentiality. Your information will never be shared. Our licensed investigators are ready to discuss your case today — no obligation.
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