Clinical Psychologist

As a clinical psychologist, Dr Willemsen applies evidence-based methods to assess, understand and clarify complex psychological presentations. His expertise spans child, family and adult psychology, with a focus on developmental, relational and trauma-related issues. In legal settings, his role is to provide impartial, structured assessments that assist courts and professionals in navigating sensitive and high-stakes matters.

Dr Willemsen is frequently instructed as an expert witness in private and public law proceedings, including cases involving child protection, parental conflict, neglect, domestic violence, juvenile behaviour , unlawful removal, adoption breakdown, and allegations of sexual abuse.

His role in these proceedings is impartial: to provide clinically robust assessments which assist courts and professionals understand complex psychological dynamics. His focus is strictly clinical. He does not advocate for either party nor offer legal opinions.
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"Dr Willemsen is a highly respected expert clinical psychologist in family proceedings, frequently used in the most complex cases where his insight, fairness, independence, and integrity have often been pivotal to the best outcomes for the children involved."
Solicitor and High Court Advocate
"I have found his insight into this family and these proceedings of the greatest assistance.  In my judgment, Dr Willemsen has understood this family, the strengths and weaknesses of each parent and HN’s current situation and needs."
Circuit Judge
"His breadth of experience and willingness to consider all aspects of psychological functioning to find both explanations and solutions make his evaluations and reports unmissable."
Solicitor and High Court Advocate

"Dr Willemsen’s evidence was balanced, very carefully thought through, illuminated by much reflective insight and, again, of very considerable assistance."

Past President of the family division

"The input he provides is invaluable to professionals and judges, families in crisis,  and the children themselves, including his recommendations for any suitable therapy which could assist with any issues identified. He could not be more highly recommended."

Solicitor and High Court Advocate

"In his thoughtful and perceptive oral evidence Dr Willemsen set out the difficult issues that arise in this case."

High Court Judge