Helen Gavin is Director of Graduate Education at the University of Huddersfield, UK, where she  also lectures in Forensic and Criminal Psychology Previously, she was Head of Psychology at the University of the West of England, UK. Her publications include The Essence of Cognitive Psychology (1998), Understanding Research Methods & Statistics in Psychology (2008),  Sex, Drugs and Rock & Roll: Psychological, Legal and Cultural Examinations of Sex and Sexuality (2010) and  Criminological and Forensic Psychology (2014)   Theresa Porter is a forensic psychologist currently practicing in Connecticut, USA. She worked for the Federal Bureau of Prisons for nearly a decade where she had extensive experience with female offenders. She lectures and publishes on violence by women, including Infanticide and Neonaticide: A Review of 40 Years of Research Literature on Incidence and Causes (with Helen Gavin; 2010), Woman as molester: Implications for society (2010), A Case of Factitious Paedophilia (with Mark D. Feldman, 2011) and Hits Like a Girl; Women who Batter their Partners (2011).