John E. Douglas is a former FBI special agent, the Bureau’s criminal profiling pioneer and one of the creators of theCrime Classification Manual. He is currently a consultant on criminal investigative analysis and the author, with Mark Olshaker, ofJourney Into Darkness,The Anatomy of Motive,The Cases That Haunt Us, andLaw & Disorder, among others.
Mark Olshaker is a novelist, nonfiction author, and Emmy Award-winning filmmaker. He has written and produced numerous documentaries, including the Emmy-nominated PBS NOVA programMind of a Serial Killer.