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The Difference Between Psychopaths and Sociopaths Andrew Heaton, Daniel J. Fox
Daniel J. Fox, Ph.D., is a licensed psychologist in Texas, international speaker, and multiple-award winning author. He has been specializing in the treatment and assessment of individuals with personality disorders for over 20 years in the state and federal prison system, universities, and in private practice.
Source: http://www.mightyheaton.com