Joni E. Johnston is an Author, clinical and forensic psychologist, private investigator, and author of three nonfiction books, including Appearance Obsession: Learning to Love the Way You Look, The Complete Idiot's Guide to Psychology,^[1] and The Complete Idiot's Guide to Controlling Anxiety. She is the author of the popular^{[citation needed]} Psychology Today law and crime blog The Human Equation, which has been viewed over 3 million times.^{[citation needed]} She is the cohost of the forensic radio show Thread of Evidence and host and producer of the true crime YouTube channel Unmasking a Murderer.

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She conducts violence risk assessments for the California Board of Parole and insanity, competency to stand trial, and mitigation evaluations for the court as well as prosecutors and defense attorneys.^{[citation needed]} A former columnist for Woman's World, she also hosted and produced State of Mind, a mental health television show sponsored by UCSD-TV.^{[citation needed]}

She earned a B.A. from Auburn University and M.S. & Psy.D. degrees from Florida Institute of Technology.^[2]