Peter Pierangeli


Peter Pierangeli has been a polygraph examiner for over 41 years. He began his career in polygraph with a New Jersey law enforcement agency in 1974. He was appointed Chief Polygraph Examiner for the state of New Jersey through civil service and served in that capacity until 1979.  In 1980, he moved to New Mexico to serve as the Chief Polygraph Examiner for the New Mexico District Attorney's Office. He later served as Assistant Chief of Criminal Investigations, as well as Chief Investigator for the State of New Mexico Medcaid Providers Fraud Unit.  In 1990, PGP Polygraph was established as a full-time polygraph firm serving New Mexico and surrounding states. He has been recognized in several federal court jurisdictions as a polygraph expert in states such as New  Jersey, New York, Pennsylvania, New Mexico, Colorado, and Arizona, for both civil and criminal cases. Mr. Pierangeli is a graduate of the Backster School of Lie Detection and the John Reid School of Polygraph. Mr Pierangeli has instructed law enforcement candidates in interview and interrogation techniques in academies in New Jersey and New Mexico.


Jonathan Pierangeli


Jonathan Pierangeli has been working in polygraph since 2008. He attended the Backster School of Lie Detection in San Diego, CA, before returning home, when he  joined his father Peter at PGP Polygraph. Jonathan holds a B.A. in Sociology from the University of New Mexico, and specializes in Post Conviction Sexual Offender testing, law enforcement preemployment testing, as well as court qualified criminal defense testing.



Spencer Brown


Spencer Brown has been a polygraph examiner at PGP Polygraph since 2015. He holds a B.A. in Psychology from the University of New Mexico and attended the Academy of Polygraph Science in Fort Myers, Florida. Spencer currently specializes in law enforcement preemployment testing, infidelity testing, and  EPPA compliant examinations.





Ralph Trotter


In addition to over 40 years in law enforcement and investigative experience, Ralph is a graduate of the Arizona School of Polygraph Science.  He has been actively engaged in polygraph examinations since 1997 providing services to hundreds of attorneys, state public defenders, law enforcement agencies, tribal agencies,  federal agencies and private clients.  Ralph has performed over 3000 polygraph examinations.






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