Robert Kenneth Ressler (February 21, 1937 – May 5, 2013) was an FBI agent and author. He played a significant role in the psychological profiling of violent offenders in the 1970s and is often credited with coining the term “serial killer.” After retiring from the FBI, he authored a number of books on serial murders, and often gave lectures on criminology.

Robert Kenneth Ressler was a criminologist in private practice and the Director of Forensic Behavioral Services International, a Virginia based consulting company. Mr. Ressler was an expert in the area of violent criminal offenders, particularly in the area of serial and sexual homicide. He was a specialist in the area of criminology, behavioral analysis, crime scene analysis, homicide, sexual assaults, threat assessment, workplace violence, and hostage negotiation.

He was a twenty year veteran of the Federal Bureau of Investigation, serving sixteen years in the FBI’s Behavioral Science Unit as a Supervisory Special Agent and Criminologist, retiring in 1990. He innovated many of the programs which led to the formulation of the FBI’s National Center for the Analysis of Violent Crime. Mr. Ressler became the first Program Manager of the FBI’s Violent Criminal Apprehension Program (VICAP) in 1985.

Robert Ressler (standing, right) with serial killer John Wayne Gacy

In addition to having been an Instructor of Criminology while at the FBI Academy, his academic affiliations included Adjunct Faculty at the University of Virginia, Research Fellow at the University of Pennsylvania, Adjunct Assistant Professor at Michigan State University’s School of Criminal Justice and he was a Clinical Assistant Professor in Psychiatry in Georgetown University’s Program on Psychiatry and Law. He was a visiting instructor with the Department of Forensic Pathology at Dundee University, Dundee, Scotland.

He was awarded the 1991 Amicus Award by the American Academy of Psychiatry and the Law, the 1995 Special Section Awarded the Section of Psychiatry and Behavioral Sciences of the American Academy of Forensic Sciences and two Jefferson Awards in 1986 and 1988, by the University of Virginia. Mr. Ressler was a member of The International and American Academies of Forensic Sciences, The Academy of Criminal Justice Sciences, The International Association of Chiefs of Police, the International Homicide Investigators Association, the Vidocq Society and other professional organizations.

Ressler (left) with serial killer Jeffrey Dahmer

He originated and directed the FBI’s first research program of violent criminal offenders, interviewing and collecting data on 36 serial and sexual killers resulting in two text books, Sexual Homicide: Patterns and Motives(1988) now in its 3rd edition and the Crime Classification Manual (1992) which was published in its 3rd edition in 2013. He also coauthored his autobiography, Whoever Fights Monsters (1992), Justice is Served (1994), and I Have Lived In The Monster (1997). Mr. Ressler’s books and real life experiences have been the inspiration for many books authored by Mary Higgins Clark and other authors and the films, Red DragonSilence of the Lambs, Copycat, and The X Files.

He has lectured at and been a consultant to law enforcement agencies, universities, writers, television networks, and corporations in the U.S. and abroad. He appeared on many major television and radio networks and has been featured in numerous printed media articles in major newspapers and magazines, worldwide.

Mr. Ressler served ten years with the U.S. Army and was active duty during the Vietnam era. He served in the military police and as an investigator with the Army Criminal Investigation Division Command Headquarters in Washington D.C. He retired at the rank of Colonel with 35 years of distinguished service.

Sources: Wikipedia / FBS International: