John Douglas, the legendary FBI criminal profiler and veteran author of true crime books, has spent decades researching and culling the stories of the world's most disturbing criminals. One of the foremost experts and investigators of criminal minds and motivations, he lives in the Washington, D.C. area.

Mark Olshaker is an Emmy Award-winning documentary filmmaker and author of eleven nonfiction books and five novels. His books with former FBI Special Agent and criminal profiling pioneer John Douglas, beginning with Mindhunter and, most recently, Law & Disorder, have sold millions of copies and have been translated into many languages. Mindhunter is now a dramatic series on Netflix, directed by David Fincher. Olshaker and his wife Carolyn, an attorney, live in Washington, D.C.