Stone's work lent support to the need for flexibility in the therapeutic approach to treating
borderline personality disorder, as advocated by Drs. John Livesley,
John G. Gunderson and
Thomas McGlashan. He described long-term follow-up of patients diagnosed with Borderline Personality Disorder, 25–50 years after initial contact. In 2017, the American Academy of Psychoanalysis and Dynamic Psychiatry awarded him for a paper describing treatment recommendations for persons with this condition. Stone was also recognized for refining the concept of
psychopathy, as described by Dr.
Robert D. Hare and Dr. David Cooke. From 2006 to 2007, he was the host of the
Discovery Channel’s
Most Evil, a true crime program based upon the 22-point Gradations of Evil scale he developed to examine acts of violence which provoke the emotional reaction association commonly termed "evil". According to Stone, "evil" acts are generally shocking and horrible, bewildering, and premeditated, and involve wildly excessive degrees of suffering. His scale, which distinguished acts with more "human" motivations, such as crimes of self-defense and passion, from violence associated with various degrees of psychopathy and sadism, was formally described in his 2009 book The Anatomy of Evil in 2009 and further delineated alongside clinical psychologist Dr. Gary Brucato in its follow-up volume, The New Evil: Understanding the Emergence of Modern Violent Crime, in 2019. == Death ==