Expertise

Dr Willemsen’s expertise is rooted in more than three decades of clinical practice, assessment, and supervision. His work brings together psychoanalytic depth with the structured methods of clinical psychology, allowing him to provide impartial, evidence-based insight in sensitive and complex contexts.

Areas of expertise include:
Jungian Psychoanalytic Practice
Long-term in-depth work and psychotherapy informed by Jungian Psychoanalysis, with an emphasis on unconsciousness processes and resilience.
Child, family and adult psychology
Specialist experience across the lifespan, including developmental and relational challenges, trauma, and high-conflict family situations.
Clinical assessment & expert witness work
Impartial psychological assessments to assist the courts in family proceedings, with a focus on child development, parental capacity, and family dynamics.
Supervision & consultation
Clinical supervision for psychotherapists, analysts, and mental health professionals, alongside consultation to multidisciplinary teams with safeguarding and social care responsibilities.
"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