As an innovator at the FBI in the late 1970s, John Douglas developed new investigative techniques for hunting serial killers, sex offenders, and other violent offenders. Advancing the use of a procedure known as criminal profiling, Douglas became widely recognized as its top authority. While leading the FBI’s Investigate Support Unit, Douglas used criminal profiling in numerous prominent cases. He entered popular culture as the model for Jack Crawford in the film The Silence of the Lambs, and his book Mindhunter was recently made into a Netflix series. Douglas’ ability to link behavior and evidence has made him the lawman serial killers fear. He knows their secrets, has learned the patterns of their bizarre rituals, and is always armed with the information needed for the police to capture these criminals and put an end to their vicious murders.