John Douglas, Mark Olshaker

John Douglas is an FBI agent who laid the foundation for the science of profiling the world’s most dangerous criminals. A veteran and true crime author, he has spent decades researching and documenting the stories of the most brutal serial killers. He is one of the leading experts and researchers into the mind of the killer—creating their profiles, describing their habits, and predicting their next moves. He lives in the Washington, D.C. area.

Mark Olshaker is an American author from Washington, D.C., who frequently collaborates with FBI agent John Douglas. Together, they have written books on criminal and investigative psychology that have sold millions of copies, offering a unique and intriguing perspective into behavioral science and criminal investigation analysis.