Mark Safarik has conducted internationally renowned research on the sexual assault and homicide of elder females. He is a member of the highly respected Vidocq Society. He is well-published in international journals, including the Journal of Forensic Sciences, International Journal of Homicide Studies, and the Journal of Interpersonal Violence. He has authored numerous book chapters on homicide, including in the newest text on sexual homicide, the Routledge International Handbook of Sexual Homicide Studies. His new book, with co-author Katherine Ramsland, Spree Killers: Practical Classifications for Law Enforcement and Criminology has been hailed as the definitive textbook on this type of multicide. Spree killers are responsible for killing at least three persons at two or more locations due to a precipitating incident that fuels the urge to kill.