Consultation and Expert Court Testimony

John Hamel

John Hamel, Ph.D., LCSW, provides individual expert consultation to mental health professionals, prosecutors, defense attorneys, victim advocates and others on a variety of issues and topics related to family violence.

His consultation services and court testimony draw upon a broad knowledge of domestic violence research, including numerous original studies in the areas of treatment effectiveness and law enforcement responses, as well as twenty years of experience working with perpetrators and victims of family violence.

Since 2001, Mr. Hamel has consulted with defense attorneys and prosecutors throughout Northern California, and has provided expert witness testimony in both the criminal court and the family court. He has been retained in a variety of misdemeanor and felony cases, involving male and female perpetrators and victims as well as defendants in same-sex relationships.


Understanding intimate partner violence and intimate partner homicide:  A research guide for prosecutors and defense attorneys

In the best interests of children: What family law attorneys should know about domestic violence


I am a criminal defense attorney in San Rafael, California, and have been working with John Hamel for many years in my domestic violence cases.

I have benefited from his trainings, have consulted with him regarding various cases, and regularly refer clients to his court-approved domestic violence perpetrator groups because his compassionate, evidence-based treatment approach is superior to the confrontational style used in other programs."

Gary Kauffman, Esq. 
San Rafael, CA