MICHAEL ARNTFIELD is a cop-turned-criminologist and professor at Western University, where he founded the Cold Case Society, an unsolved-crimes college think tank. He is also a director with the Murder Accountability Project in Washington, DC, has served as a visiting professor at Vanderbilt University and has trained police around the world on cold case serial homicides, including as a speaker at the FBI Academy in Quantico. The author of over a dozen true crime books and criminology textbooks, he makes regular appearances on the Discovery Channel, Investigation Discovery and Oxygen, and is a staple expert on crime in both American and Canadian media. Visit him at michaelarntfield.com.