When attempting to define and understand rape, the behavioral dynamics of the crime itself must be examined. To accomplish this task, a review of the existing research and work of those who initially explored the behavioral aspects of rape is required. Those pioneers, including renowned clinical psychologist Dr. Nicholas Groth and the highly esteemed, retired Federal Bureau of Investigation (FBI) Supervisory Special Agent Roy Hazelwood, have provided law enforcement with an extensive yet practical foundation from which to understand and effectively investigate this egregious crime.