Mark Olshaker is an American author and filmmaker, best known for his work in the true crime genre and his collaborations with former FBI profiler John Douglas. Together, they have co-authored several books, including "Mindhunter," which delves into the psychological profiling of serial killers and criminal behavior. The book was later adapted into a popular Netflix series. Olshaker's work often explores themes of criminal psychology, law enforcement, and the complexities of the human mind. If you have specific aspects of his work or life you'd like to know more about, feel free to ask!