Retired agent Dr. Jerry Clark, Ph.D., served a total of 21 years in federal law enforcement. He was an NCIS agent and a DEA agent, prior to becoming a special agent with FBI. Jerry Clark was previously interviewed on Episode 13 of FBI Retired Case File Review about one of the most bizarre bank robbery schemes in the history of the FBI, known officially as COLLARBOMB. In this episode, Jerry Clark reviews the criminal case and trial of Marjorie Diehl-Armstrong, the mastermind behind the Collarbomb pizza delivery case and the activity of other female serial killers. Jerry Clark has a Ph.D. in in Criminology and he is currently an Assistant Professor of Criminal Justice at Gannon University in Erie, Pennsylvania. He and his co-author Ed Palattella have written their third true crime book Mania and Marjorie Diehl-Armstrong: Inside the Mind of a Female Serial Killer to be released on September 12, 2017. You can learn more about Dr. Jerry Clark and his other true crime books by visiting the Pizza Bomber website.

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Retired agent and former FBI profiler Dr. Mary Ellen O’Toole, Ph.D., served in the FBI for nearly 28 years. For more than half of that time, she worked in the Bureau’s prestigious Behavioral Analysis Unit (BAU) where she consulted on many of the FBI’s highest profile and most complex cases, including homicides, kidnappings, sexual assaults, predatory behavior, child molestation and other crimes of violence. In this episode of FBI Retired Case File Review, Mary Ellen O’Toole, who is recognized as the FBI’s leading expert in “psychopathy,” discusses serial killers and reviews the case of the Green River Killer Gary Ridgway, who was convicted of killing 49 women. Post retirement, Dr. O’Toole is an internationally recognized Forensic Behavioral Consultant and Lecturer. She makes frequent media appearances on major TV news programs and radio affiliates and has been interviewed in prominent newspapers and publications around the country. In 2015, Mary Ellen O’Toole was appointed as the Director of the Forensic Science Program at George Mason University in Fairfax, Virginia. Her book Dangerous Instincts: How Gut Feelings Betray Us introduces the right way to assess people for everyday situations in our personal and professional lives, and how to make safer decisions about them and the situations they create for us. You can learn more about Dr. Mary Ellen O’Toole by visiting her website MaryEllenOtoole.com.

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