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About Us

Radius Investigations is a full-service agency that is comprised of an extensive team of experienced professional private investigators, with resources throughout the world. This ensures that our investigative services can handle and go anywhere your needs may take us. Our private investigation agency consists of professionals who are licensed, bonded and insured to conduct surveillance and investigations in New York, the United States, and internationally.

We pride ourselves on maintaining full confidentiality and discretion from the moment you first reach out to us. Whether its through our 24/7 phone support or requesting a consultation through our website, everything is handled with the upmost care and kept classified. Our goal is to provide peace of mind to you in an otherwise stressful situations and provide you with actionable intelligence to help you make the most informed decision for your case.

Our headquarters are in the heart of Long Island in Suffolk County, located on Motor Parkway, Hauppauge, New York. Our services are available throughout Long Island, the five boroughs (Queens, Brooklyn, Manhattan, the Bronx and Staten Island), with coverage worldwide.

Matthew Seifer is the founder, owner and lead investigator of Radius Investigations. He’s is a U.S Army Veteran, with over 26 years on the private sector. Matt is not your typical PI: his work in security and education has made him evolve into not just a private investigator, but an instructor and mentor to help provide safety and security to the public. He has been featured on local and national media platforms, including Inside Edition for his work in providing active shooter response training and drills for schools and the workplace.

Meet the Expert