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Dr. Katherine Ramsland teaches forensic psychology and behavioral criminology in the graduate criminal justice program at DeSales University in Pennsylvania. She has appeared as an expert in criminal psychology on more than 250 crime documentaries and magazine shows, was an executive producer of Murder House Flip, and has consulted for CSI, Bones, and The Alienist. The author of more than 1,800 articles and blogs, and 73 books, including The Forensic Science of CSI, The Forensic Psychology of Criminal Minds, How to Catch a Killer, and Confession of a Serial Killer: The Untold Story of Dennis Rader, The BTK Killer, she was co-executive producer for the Wolf Entertainment/A&E four-part documentary based on her interviews of Rader. She also worked closely with Elmer Wayne Henley Jr. to tell his story. Recruited by “Candy Man” Dean Corll to procure victims, Henley ultimately killed Corll and showed police where victims were buried. Ramsland’s book, with Tracy Ullman, is The Serial Killer’s Apprentice.