Josie Mansergh-Johnson

Josie Mansergh-Johnson is a Psychotherapist at Harbor who specialises in addiction and childhood trauma. She also works with depression, anxiety, eating disorders, relationships and life transitions, and with the mental health pressures faced by entrepreneurs and high achievers.

Alongside individual clients, she supports family members, teenagers and adult children of alcoholics. Her approach is humanistic and compassionate, informed by Jungian ideas and grounded in evidence-based therapeutic skills.

Josie has worked in clinical settings in both the UK and the United States, with children and families as well as adults. This has included work with families affected by addiction and with people who have co-occurring conditions, such as addiction alongside depression or anxiety.

Professional Background & Qualifications

Josie holds a Master’s in Counselling with an Addiction Speciality and a Postgraduate Diploma in Addiction Psychology and Counselling.

She has also completed training in transpersonal psychotherapy and is currently studying for a PhD in Mental Health Counselling.

Josie is a registered member of the British Association for Counselling and Psychotherapy. In the United States, she is registered to practise in California and Connecticut.

Her further training includes working with children, addiction intervention and dialectical behaviour therapy.

Healthcare Leadership & Experience

Josie’s clinical work takes a family systems perspective, looking at how addiction and trauma affect the whole family as well as the individual.

Alongside her clinical work, Josie teaches and conducts research. She has taught master’s-level clinicians at Hazelden Betty Ford Graduate School, and undergraduates in civic engagement at Pace University.

Her research on culturally adapted cognitive behavioural therapy (CBT) for PTSD has been published in the Journal of Counselling & Development. She has also been invited to act as a Subject Matter Expert for the American Counselling Association, reviewing research submissions for its best-practice briefs. 

Approach to Care

Josie’s work is trauma-informed and integrative. She adapts it to each person and to the family and culture around them.

Her research into culturally adapted therapy also shapes her practice, and she pays close attention to how a client’s background affects their experience of treatment.

At Harbor, she works with individual clients and their families, particularly where addiction is involved.