Professional Services/Expert Witness Testimony


Unless otherwise indicated, trainings range from 1 hour to multiple days, and tailored to your particular needs. John Hamel also offers standard certification trainings for batterer intervention and child abuse program facilitators. Presentations include use of Power Point slides, informational handouts, audience participation, relevant exercises and Q&A.

  • Domestic Violence:  An Overview of the Latest Research
  • Evidence-Based Assessment and Intervention
  • Domestic Violence and Child Custody
  • The Effects of Domestic Violence and the Battered Woman’s Syndrome
  • Male Victims
  • Law Enforcement Responses:  Mandatory Arrest and Dominant Aggressor Policies
  • Domestic Violence and Substance Abuse
  • Domestic Violence Worldwide and Cross Cultural Issues
  • Domestic Violence in the LGBT Community

CEUs Available for LCSWs and MFTs
MLEs Available for Attorneys


NEW! “Research-Informed Domestic Violence Defense” is a 2-hour primer for criminal defense attorneys.  For information or to register for the next training, CLICK HERE.

For online courses and CEUs, go to:


John Hamel, Ph.D., LCSW, provides expert witness services and case consultation on a variety of issues and topics related to domestic violence and psychological trauma.  He draws 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.

Dr. Hamel has worked with prosecutors as well as defense attorneys, in both family law and criminal cases, as well as civil tort cases.  His areas of expertise include the following:

  • Advantages and limitations of Battered Women’s Defense
  • The impact of domestic violence on children
  • Domestic violence and parental alienation
  • Flaws in domestic violence arrest and prosecution policies
  • Differences and similarities between male-perpetrated and female- perpetrated domestic violence


Features of an Evidence-Based Intimate Partner Abuse (IPA) Assessment

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


“Having worked as an Adjunct Professor a the University of San Francisco for the past 22 years, and valuing quality continuing education to enhance my skill base as a professor as well as a therapist, I highly recommend John Hamel’s training. I was so impressed with his material that I have implemented his book as the textbook for the USF Spousal and Partner Abuse course. John’s state-of-the-art material was well organized and professionally presented.”

 – Tanda Ainsworth, MFT, University of San Francisco, School of Education

“John, I wish to commend you for a professional, well-researched, broad-based, in-depth and challenging domestic violence training. Thank you!”

 – Douglas L. Marum, Ph.D., MFT, Certified Batterer Intervention Provider, Private Practice, Napa, CA

“Training by John Hamel is enlightening. His years of experience paired with cutting edge research creates a progressive program that gives hope to the ideal of rehabilitation. I will continue to reference this training for years to come in my professional life.”

 – Allison Vickery, MA, San Francisco, CA