Retired agent Mark Safarik served in the FBI for 23 years. He spent the last half of his career as a member of the elite Behavioral Analysis Unit (BAU) where he established himself as an internationally recognized expert in the analysis and interpretation of violent criminal behavior. In this episode of FBI Retired Case File Review, Mark Safarik discusses his analytical work on spree killings and the differences between spree, serial, and mass killings. He also talks about his time as a profiler in the BAU, his membership in the Vidocq Society, and the popularity of true crime TV shows, podcasts, and books. Mark’s 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. Read my post - Deprivation of Rights Under Color of Law Investigations Join my Reader Team to get the FBI Reading Resource - Books about the FBI, written by FBI agents, the 20 clichés about the FBI Reality Checklist, and keep up to date on the FBI in books, TV, and movies via my monthly email. Join here.   Jerri Williams, a retired FBI agent, author and podcaster, attempts to relive her glory days by writing and blogging about the FBI and hosting FBI Retired Case File Review, a true crime/history podcast. Visit her website to check out her books, available as audiobooks, ebooks and paperbacks wherever books are sold.