Karl Roberts is a forensic psychologist and professor of policing and criminal justice at the University of Western Sydney in Australia. He also has a joint appointment as associate professor of Criminal Justice at the University of Massachusetts, Lowell. His specific areas of expertise are within the broad field of interpersonal violence and law enforcement investigation, focusing on psychological and behavioral assessment of offenders, investigative interviewing, and threat assessment and management. He has particular interests in the psychology of honor and honor-based violence, and threat identification and management of violent crimes, such as stalking and honor-based crimes. He also has expertise in investigative interviewing by law enforcement and other agencies and has published a number of papers. He works closely with law enforcement and other agencies throughout Australia, the United Kingdom, Europe, and the United States providing training and advice to investigations in the form of threat assessments and investigative strategies. To date, he has provided advice to over 450 major police investigations.

Gerry Campbell is detective chief superintendent with 26 years of service in London's Metropolitan Police Service (MPS). He is currently the borough commander in central Inner London. He also is currently the United Kingdom's Association of Chief Officer's deputy lead for honor-based violence, forced marriage, and female genital mutilation. He co-authored ACPO's first honor-based strategy. While leading high-risk operations, he has also led Scotland Yard's policy development relating to public protection including domestic violence, honor-based violence, hate crimes, and the management of registered sexual offenders and dangerous offenders. He has chaired and led a number of strategic groups relating to these crime genres and has been an important part of key national strategy groups. He has worked with the U.K.