From Jack the Ripper to Jeffrey Dahmer to the Gilgo Beach killer, serial killers have long inspired public fear – and public fascination. Louis Schlesinger, PhD, a professor of psychology at the John Jay College of Criminal Justice in New York and co-investigator of a research project on sexual and serial murder with the FBI Behavioral Science Unit, talks about what we really know about these murderers’ motivations and their methods, how some manage to avoid capture for so long, and how forensic psychology research can help investigators solve cases.