Notable profilers

Throughout the 20th century there have been many prominent figures in offender profiling. In 1943 Walter C. Langer developed a profile of Adolf Hitler that hypothesized his response to losing the war. James Brussel was a psychiatrist who rose to fame by creating an accurate profile that led to the capture of New York City's Mad Bomber in 1956. He continued to work with NYPD for 15 years earning him the name "The Sherlock Holmes of the Couch".

In 1972, the Behavioral Science Unit of the FBI was formed by Patrick Mullany and Howard Teten; they increased the abilities of detectives by examining the evidence for signs of mental disorders and other traits of the perpetrators. After successes including identification of serial killers by their "souvenirs", this system of techniques grew into the modern Criminal Investigative Analysis Program (CIAP). Following Teten's departure John Douglas and Robert Ressler created a typology of sex murderers and formed the National Center for Analysis of Violent Crime which further studied behavioral patterns and characteristics that advanced offender profiling as a science.

Investigations of notorious serial killers Ted Bundy and the Green River Killer were preformed in 1974 by Robert Keppel and psychologist Richard Walter. They went on to develop the four subtypes of violent crime and the Hunter Integrated Telemetry System (HITS) database which compiled characteristics of violent crime for research.