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

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.

Certified Clinical Psychologist

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.


Dr Harriet Heal

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.

Chartered Clinical Psychologist
London Bridge / Sevenoaks in Kent

Lina Kaoud

Lina trained at the Tavistock Centre and is a member of Tavistock Society of Psychotherapists as well as a member of British Association of Counsellors and Psychotherapists. She is accredited by the British Psychoanalytical Council.

Lina’s experience includes working at the Counselling and Psychotherapy Department at Kings College Hospital providing counselling and psychotherapy for both inpatients and outpatients with medical illnesses, injuries and, sometimes, terminal diagnoses, such as cancer. She also worked with their relatives who were affected by trauma, loss and bereavement. She has gained extensive and thorough experience working as part of the Adults Complex Needs Service and the Trauma Unit at the Tavistock and Portman NHS Trust, helping patients to manage a wide range of complex issues including anxiety, depression, self-harm, sexual abuse and trauma. In addition, Lina has worked in several mental health charities, including, The Centre for Better Health Counselling Service and the Caris Islington Bereavement Service.

Her practice is based at Longcroft House EC2M 4NS close to Liverpool Street Station in London.

Psychodynamic Psychotherapist & Counsellor

Mimi Kester, B.A. Hons

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 (

Senior Accredited Counsellor

Dr Sharon Lewis

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.

Chartered Clinical Psychologist
Amersham, Buckinghamshire

Joseph Mishan

Joseph Mishan qualified as a psychoanalytic psychotherapist in 1995 and subsequently trained in ISTDP, qualifying in 2010. He worked for 26 years in an NHS psychotherapy department in north London and is now in private practice.

He is also a mindfulness practitioner and teacher. He is an environmental activist and understands that the intensifying climate and ecological crisis has an impact on mental health.

He has a small private practice in his home town of Bishops Stortford.

Psychodynamic Psychotherapist 
Bishops Stortford
(please note he no longer offers couple therapy)

Dr Thomas Mitchell

Dr Thomas Mitchell is a Clinical Psychologist registered with the Health and Care Professions Council (HCPC). He began practising ISTDP in 2012 and undertook his three year core training from 2015-2018. Having worked in the NHS for 12 years in various settings, he left to set up a private practice. He has experience treating a wide range of emotion-related problems, including depression, anxiety, trauma, OCD, Bipolar Disorder and various personality disorders. His areas of special interest include trauma, unexplained physical pain and attachment. In addition to his clinical work, he has taught at the University of Hertfordshire on both Clinical Psychology doctoral training and nursing degree programmes. Currently, he teaches ISTDP at the University of Nottingham on the Clinical Psychology doctoral training programme. He has also published research in the area of disability and mental health.

Clinical Psychologist
Telephone: 07515821753

Luiza Neumayer

I am chartered psychologist, also qualified in Jungian psycho-dynamic counselling and psychotherapy. I am registered with the British Psychological Society, the Health and Care Professions Council (HCPC) and the British Association of Counselling and Psychotherapy.

I work with both individuals and couples. For couples, I’m a Certified therapist in Emotionally Focused Therapy for Couples (EFT).

I have experience in treating a wide range of emotion-related problems, like depression, anxiety, attachment trauma, relationship issues, panic attacks, isolation, bereavement and loss, psychosomatic disorders, sexual abuse trauma and various personality disorders. My areas of special interest include relational trauma and attachment.

My office is based in Marylebone, London and in Amersham, Buckinghamshire.

Chartered Counselling Psychologist & Psychotherapist
Marylebone, London and in Amersham, Buckinghamshire

Dr David Priestley

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.

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

Dr Emma Selby, CPsychol

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.

DPsych Counselling Psychology
Glasgow, Scotland

Dr Rohan Naidoo

Dr Rohan Naidoo qualified as a Clinical Psychologist in 2011 (HCPC Accredited), and as an ISTDP Practitioner in 2014 (IEDTA Certified).

Experienced in both NHS and Private settings, he has worked with people wanting help with a variety of difficulties. 

Areas of particular specialism include self-esteem, anxiety, and mind-body dynamics.

He appreciates the in-depth nature of ISTDP, and its capacity to “get to the root” of many issues. With this in mind, he is currently carrying out a PhD at The University of Essex; this research explores the nature of Identity from the perspective of depth psychotherapies, which includes ISTDP.

He is available for online and face-to-face work in London, time-limited and open ended therapy, in weekly and less regular “block therapy” formats.

Clinical Psychologist

Harriet Gordon

I am an experienced Child & Adolescent Psychotherapist, working with older children, young people and adults suffering from a range of complex emotional, relational and behavioural issues. I gained an MA in Child, Adolescent, and Family Psychodynamic Psychotherapy at the Tavistock & Portman Trust and continued my interest in working with acute complexities by studying at The Portman assessing and working with risk. In 2023 I completed core training with ISTDP London.

I have worked within a CAMHS team in London, a Rape & Sexual Abuse Service and in schools, with young people facing acute challenges, including issues like self-harm, anxiety (panic attacks, ticks) suicidality, abuse, and mental health crises. As well as my private practice in both London & Hereford, where I offer both face-to-face sessions as well as online, I run a specialised therapeutic service for schools working in challenging social areas.