The following list of therapists is provided for your convenience. This is not an endorsement of any of the individuals listed and ISTDP London is unable to assess the appropriateness of any therapist for an individual client’s needs. ISTDP London takes no responsibility for the outcome of any decisions made to contact therapists on this page.

Rania M. Bizri

Certified Clinical Psychologist

Rania has a Masters in Clinical and Pathological Psychology. She is a Certified Clinical Psychologist registered with the Lebanese Ministry of Health as well as the Lebanese Ministry of Culture and Higher Education.  She has received personal and group supervision from different IEDTA accredited trainers and supervisors, in particular Dr. Sharon Lewis.

Rania works in private practice in Lebanon and provides both person-to-person and online consultations for persons living within and outside Lebanon. She speaks fluent French and English. Rania exclusively uses ISTDP methods and techniques and has successfully worked with adults suffering from a range of psychological difficulties, including depression, anxiety disorders, somatic symptom disorders, personality disorders and dysfunctional relationships.

Rania embraces psychotherapy as passion rather than a profession. She truly believes in the transformational powers of psychotherapy, namely ISTDP based psychotherapy.

Catherine Colley


Catherine Colley has an MSc in Psychodynamic Psychotherapy and is registered and accredited by the BACP. She has several years experience of working in an NHS Psychological Outpatients Dept and in a University Students’ Counselling Service. Catherine has experience working with people from the media and arts world who suffer from performance anxiety, creative blocks and self doubt. Her aim is to enable her clients to reach their full creative potential.

Catherine has further advanced training in ISTDP and runs a private practice in Central London providing brief and longer-term therapy to adults.

Marilyn Gulland


Marilyn is a psychotherapist and counsellor registered with the British Association for Counselling and Psychotherapy.  Marilyn has worked with clients on a one-to-one basis for several years, most recently with students at a London Conservatoire, and in private practice in Central London.  Marilyn has a diploma in integrative psychotherapeutic counselling and a law degree from Durham University.  She has practiced as a solicitor in the City for over twenty-five years, and so particularly understands the challenges and demands of working in an intense, competitive environment.  Marilyn is particularly interested in helping driven individuals negotiate and balance their internal needs within a demanding and pressured environment, and is passionate about helping people achieve their fullest potential through intensive, brief and longer-term therapy.  She is experienced in providing therapy for a wide range of emotional, relational and behavioural issues.  She works exclusively using intensive short-term dynamic psychotherapy.

Central London
[email protected]

Dr Harriet Heal

Chartered Clinical Psychologist

I am an experienced clinician and supervisor with 24 years of experience since qualification in both NHS and private settings. I am registered and regulated by the British Psychological Society, Health Care Professions Council and Association of Cognitive Analytic Therapists. I completed training in Cognitive Analytic Therapy shortly after qualification, and I’m currently training in Intensive Short Term Dynamic Psychotherapy with Dr Sharon Lewis.

I have extensive experience in treating a broad range of emotional difficulties including anxiety disorders, depression, relationship difficulties, work stress, problems with emotional regulation, self harm and adjustment to change. This long experience means I’m particularly excited to be using ISTDP to help clients understand and recognise their own emotional processes more clearly and to help them overcome the unconscious emotional blocks that may be causing distressing symptoms and preventing them from moving forwards, and that may unwittingly get in the way of recovery using other therapeutic techniques.

London Bridge / Sevenoaks in Kent
[email protected]

Mimi Kester, B.A. Hons

Senior Accredited Counsellor

I am a Senior Accredited psychodynamic counsellor with 20 years of counselling experience in the NHS, in organisational settings and with students at St. Anne’s College, Oxford University. After a degree in Russian and French from Bristol University, I qualified as a teacher of modern languages at King’s College, London University and taught in London. Following my post-graduate diploma in counselling from Reading University in 1994, I worked as a counsellor in Primary Care at GP surgeries in Oxfordshire and at the John Radcliffe Hospital Womens’ Centre.

In 1995 I took on the co-chair of the Oxfordshire Association of Counsellors in Primary Care. Until 2010 I worked as a counselling associate for Thames Valley Police. I have studied further in Group Analytic Therapy and in Cognitive Analytic Therapy at the Warneford Hospital, Oxford and in Intensive Short-term Dynamic Psychotherapy.I abide by the guidelines set out in the Ethical Framework for Good Practice in Counselling and Psychotherapy by the British Association for Counselling and Psychotherapy (


Dr Sharon Lewis

Chartered Clinical Psychologist

Dr Lewis is a chartered clinical psychologist registered with the British Psychological Society and the Health and Care Professions Council. She has experience both in private practice and in the NHS and has a particular interest in working with clients with anxiety difficulties and treatment-resistant depression, as well as those diagnosed with physical health conditions such as auto-immune disorders, fibromyalgia and chronic pain.

She is an IEDTA accredited ISTDP supervisor and trainer and provides individual supervision in ISTDP as well as running introductory courses and core training groups as well as presenting nationally and internationally at workshops and conferences. Her approach is focused on the attachment-based model of ISTDP.

Amersham, Buckinghamshire
[email protected]

Antony Malvasi

Counselling Psychologist

I am a qualified Counselling Psychologist (BPS and HCPC registered) and an ISTDP practitioner working as a senior clinician and supervisor in the NHS and in private practice. I have 20 years experience working in the field of mental health, specialising in addictions. I treat an array of emotional difficulties such as anxiety, depression and blocked emotions from the past which may holding a person back in their current life or cause them to repeat destructive patterns. I also help with sexual and gender identity issues. I am a yoga teacher and am interested in personal and spiritual development, helping to achieve greater self-acceptance and balance in one’s life through promoting mind-body awareness. I practise in Central London.

Dr David Priestley

Practitioner Psychologist, CPsychol, AFBPsS, MSc, BSc, PG-Cert

I started work in high performance settings over 20 years ago and I’ve been learning to combine real work with real people in the real world, alongside theory, ever since. During that time I’ve come to know what it means to work with clients under pressure. The tougher you find your challenges the more I will push myself to help you find your solutions.


My therapeutic approach is shaped by the attachment-based model of Intensive Short-Term Dynamic Psychotherapy (ISTDP). I am registered with the Health Care Professions Council (HCPC) as a practitioner psychologist, and a Chartered Psychologist (CPsychol), and Associate Fellow of the British Psychological Society (AFBPsS). I am a member of the IEDTA (International Experiential Dynamic Therapy Association), and have completed an accredited core training in ISTDP, as well as further advanced training.


As well as working with you, I work on myself, to experience what it’s like being where you are now.  I live with my wife, Elisabeth and two children. I practise from an office in Amersham, Buckinghamshire and undertake online consultations regularly.

Amersham, Online
[email protected]

Dr Emma Selby, CPsychol

DPsych Counselling Psychology

My professional training is in Process-experiential/Person-centered Therapy, Cognitive Behavioural Therapy (CBT) and Psychodynamic Psychotherapy. Post-qualification, I have completed additional training in Cognitive Behavioural Therapy for Disordered Eating (CBT-E) and am currently training in Intensive Short-term Dynamic Psychotherapy (ISTDP). Qualifying in 2013, I have worked both in the NHS and in private healthcare and have particular interest in disordered eating and trauma.

Recognising that each of us is unique, I view therapy as a highly individualised process that aims to help us better understand how our own internal world may be impacting our external problems. The difficulties we experience in life can be highly impactful on how we see ourselves, how we relate to ourselves/others and on our own wellbeing. We can become stuck in unhelpful patterns of behaviour, trapped in our own internal conflict and afraid of/detached from our own emotion. Focus is placed on gaining a compassionate understanding of why our lives are as they are and on processing any blocked emotion that is preventing change.

Glasgow, Scotland
[email protected]