Dr. Joni Johnston is a clinical/forensic psychologist, private investigator and crime writer who got hooked on true crime at age fourteen, while reading Helter Skelter on a family vacation. She has spent her career inside prisons, forensic hospitals and criminal courts and has worked with offenders and victims.

She especially enjoys communicating with the general public about crime and writes a blog for Psychology Today called the Human Equation. She also hosts a youtube channel called Unmasking a Murderer. She has been interviewed on numerous media outlets including 48 Hours, 20/20, and several Investigative Discovery shows.