Contact Details

UK Phone :+44 (0) 2392 706929
Email :
International contact details

Clinical Team


As well as the detection and prevention of occupational and operational mental health issues, March on Stress is able to arrange expert clinical assessment and treatment as required.

Our team includes psychiatrists, clinical psychologists and mental health nurses, all with unrivalled experience and expertise in their fields.

Please contact us at at to discuss your clinical requirements.

Dr Karla Greenberg


Clinical Director

Karla is an experienced consultant psychiatrist who has previously worked for many years in the National Health Service. She is the clinical lead at March on Stress and oversees our mental healthcare activities including the Wellness (psychological health monitoring) service and the March on Stress Vetlife Health Support Team. In her role she is responsible for direct clinical care, supervision of other clinical staff and policy development, implementation and audit.

Karla has a particular interest in Older Persons’ Mental Health, including cognitive assessment and dementia care. She also has a keen interest in mental health law, particularly the Mental Capacity Act. As such, she has roles as both a Lord Chancellors Special Medical Visitor, with specific duties under the Mental Capacity Act, and a Section 12(2) approved doctor, with specific duties under the Mental Health Act.

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Darren Humphrey

Dip HE, BSc Hons, RN (MH)

Clinical Services Manager

Darren Humphrey is a Senior Clinician at March on Stress. Working predominantly for the clinical side of the business, Darren helps to provide evidence-based clinical support and treatment for clients, including through our Vetlife Health Support Service which provides mental health support to the veterinary profession. Darren also provides support and guidance in the delivery of peer support programmes TRiM (Trauma Risk Management) and StRaW (Sustaining Resilience at Work).

Prior to his role at March on Stress, Darren completed a successful 29 years in the Royal Navy, where he was the Senior Nursing Officer for Royal Navy Mental Health and Specialist Nurse Advisor to Command prior to leaving the service. With a professional background in Occupational Mental Health, he has specialist qualifications in the management of psychosis and trauma, and has training in EMDR, CBT and Solution Focused Therapy.

During his military service he deployed on several operational tours, including the first Gulf War in 1991 as an engineer, and Afghanistan in 2009 as the OC for the Field Mental Health Team.  He has successfully managed large departments and teams and has been responsible for service delivery of mental health care to Armed Forces personnel.  He was the Senior Nursing Officer for Royal Navy Mental Health and Specialist Nurse Advisor to Command prior to leaving the service.

He studied at Portsmouth University and graduated in 2002 as a Mental Health Nurse. In 2005 he gained a Queens Commission, becoming a Nursing Officer, prior to completing a BSc Hons in Psychosocial Interventions for Psychosis in 2006.   

In addition to his role within mental health, Darren was appointed to the Royal Naval Leadership school in 2012, where he served as the Senior Leadership Training Officer for 2 years. During this period he was responsible for the delivery of Leadership training for the Royal Navy.

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Nicky Gibson

Dip HE, BA (Mental Health), RN (MH)

Senior Clinician

Nicola (Nicky) Gibson is one of the March on Stress clinical team. Her background is as an NHS Mental Health Nurse for 23 years working in both inpatient and community settings including considerable time as the locality mental health lead for multi-agency professional meetings. Since qualifying in 1996 she has a wide range of experience in working with individuals experiencing depression, anxiety and other mood disorders, personality disorders, psychosis and the management of clinical and associated risks.

Nicky has a BA in Mental Health Care and is a qualified Solution Focused Brief Therapist. She has also completed a broad range of other therapeutic skills training in Dialectical Behavioural Therapy (DBT), Acceptance and Commitment Therapy (ACT) and CBT for Depression, Anxiety and Psychosis. She has completed training and worked as a clinical supervisor.

Within the March on Stress team, Nicky provide evidence-based assessment and clinical support, case management and treatment for a range of individuals who present with mental health difficulties. She is also one of the Vetlife Health Support service clinicians.  

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Lynn Tong

Clinical Administrator

Lynn is responsible for clinical administration and co-ordinates the clinical services for March on Stress and Vetlife Health Support. The role involves liaison with client organisations, clinicians and patients and Lynn works closely with others in the Clinical Team to deliver a professional service.

Lynn is a CIPD Chartered Member and has a HR background working as a HR Specialist in the Public Sector.

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We also work with expert clinical associates, our clinical assosicates include:

Matthew Wesson

BABCP Cognitive Behavioural Therapist and EMDR Accredited Trainer & Consultant

Matthew is an accredited Cognitive Behavioural Therapist and also specialises in Post-Traumatic Stress Disorder (PTSD). This includes the teaching, supervision and delivery of EMDR, which is a UK and World Health Organisation recommended treatment for this condition. He is an EMDR Europe Accredited Trainer, one of only 8 in the UK and Ireland.

He has more than 20 years' experience in the military and over 15 years working within occupational mental health with substantial experience of working with both the public and private sector.

He is an accomplished teacher and has developed mental health training packages used across the defence community. Matthew's work includes providing therapeutic input for patients, supervising other clinicians and teaching mental health interventions to medical and non-medical staff. He has had papers published in peer reviewed journals on CBT and EMDR and has spoken at several international conferences.

Matthew has delivered mental care and TRiM support in a wide range of settings including international conflict areas. In 2009 he was a Winston Churchill Fellow during which time he worked with the US Army mental health services in Washington and Texas.

Matt's extensive training experience has been recognised with a Certificate for Teaching in the Lifelong Learning Sector (CTLLS), a national teaching qualification.

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Dr Deirdre MacManus


Dr Deirdre MacManus is a consultant forensic psychiatrist and senior clinical lecturer at the Institute of Psychiatry, Psychology and Neuroscience, King’s College London. She maintains a diverse clinical practice and is the consultant forensic psychiatrist for HMP Wandsworth (South London and Maudsley NHS Trust), consultant psychiatrist for the Traumatic Stress Clinic and clinical lead for the NHS London Veterans’ Service (Camden and Islington NHS Trust).

Dr MacManus studied medicine at Edinburgh University before specialising in psychiatry. She became a member of the Royal College of Psychiatrists in 2006 and completed her specialist training in forensic psychiatry at the Maudsley Hospital. She completed a master’s degree in forensic mental health. As well as her clinical work, Dr MacManus has led a number of high profile research projects at the Institute of Psychiatry, King’s College London. Her main area of research is mental disorders and offending, particularly with respect to trauma-related disorders. She has a special interest in the impact of occupational trauma, and in particular, the mental health of military personnel. She completed her PhD in this area in 2013 and has published and presented widely in this field. She has been awarded funding from both the Medical Research Council and the National Institute of Health Research. As senior clinical lecturer at the Institute of Psychiatry, King’s College London, she maintains an active role in medical education at undergraduate and postgraduate levels and supervises students undertaking masters and PhD level research.

Dr MacManus has extensive experience in providing independent psychiatric assessments and expert reports (in criminal and civil proceedings) in cases ranging from trauma-related psychological injury, personality disorder, severe and enduring mental illness and addictions, and in employment-related mental health issues.

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Dr. Neil J. Kitchiner

RMN, BA (Hons), MSc, PhD

Dr Neil Kitchiner has more than 30 years experience of working in NHS mental health services within the UK (England & Wales) and Australia. Neil has also worked in the private sector at the Priory Hospital Bristol, and for the past 14 years as a Cognitive Behavioural Psychotherapist (CBT therapist). Neil is primarily employed in the NHS as the Principal Clinician at the Veterans' NHS Wales service and with the Cardiff Traumatic Stress Service. He has previously served in the UK Armed Forces and deployed to Afghanistan as part of the Field Mental Health Team.

Neil also works at Cardiff University in a research capacity and has written over 30 papers, book chapters, and Cochrane Reviews on a variety of military and trauma related topics. He has previously been a board member of the European Society of Traumatic Stress Studies (ESTSS) and was a founding board member 2008 of the United Kingdom Psychological Trauma Society. Neil is an accredited member of the Behavioural and Cognitive Psychotherapy Association (BABCP) and a committee member of the SWWBABCP branch and past chairperson (2012). He is also an accredited EMDR practitioner with EMDR Association UK & Ireland.

Neil uses a mixture of CBT and other trauma focused psychological therapies including eye movement desensitization reprocessing (EMDR) therapy. He is also interested in the use of Mindfulness Therapy within a CBT model. His research interests are focused on the treatment of traumatic stress and ex-service personnel.

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Dr Dominic Murphy

MA PhD DClinPsy

Dr Dominic Murphy is a Clinical Psychologist and clinical lecturer at the Institute of Psychiatry, Psychology and Neuroscience, King's College London. Dr Murphy studied for an MA in psychology at Glasgow University before completing a PhD at King's College London and then a doctorate in clinical psychology from Royal Holloway University.

Dr Murphy has experience in providing psychological assessments and treating a range of psychological difficulties. He has specialised in working to support those with post-traumatic stress disorder and work related stress. He has experience of offering a range of psychological interventions including cognitive behavioural therapy, EMDR, systemic therapy (for example narrative therapy), psychodynamic therapy and compassion-focussed therapy.

As well as his clinical interests, Dr Murphy has extensive research experience within the field of military mental health and in particular trauma-related disorders. He is widely published within this area, has presented at many international conferences and been awarded a number of grants to conduct research projects.

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Dr Tess Browne

BSc (Hons), PgDip CBT, DClinPsy, CPsychol

Dr Tess Browne is a Chartered Clinical Psychologist, Accredited Cognitive Behavioural Psychotherapist and EMDR Practitioner. She has worked in the field of psychology for more than twelve years in community mental health services, medical clinics, inpatient and outpatient hospital settings and with military personnel. Dr Browne specialises in treating older adolescents (aged 15+), adults and couples with a wide range of mental health issues and psychological problems, from mild to more complex difficulties. She has particular expertise in treating difficulties arising from traumatic or very stressful life events.

In addition to therapy, Dr Browne regularly provides clinical supervision, consultation and training to trainee and qualified mental health professionals, and has lectured on undergraduate, post-graduate and doctoral psychology courses. Dr Browne has published academic research in a range of highly respected peer-reviewed journals and presented at a number of national and international conferences.

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Dean Whybrow

RN(MH) BSc(Hons) MSc

Dean is a mental health nurse who specialises in psychological therapies delivered either in person or via the internet. He is experienced in helping people when they are suffering with low mood, anxiety or traumatic memories. The two therapies that he offers are Cognitive Behavioural Therapy (CBT) and Eye Movement Desensitisation and Reprocessing (EMDR). Both are goal focussed, brief interventions, and are underpinned by research and recommended by national clinical guidelines. Dean has extensive experience of delivering these therapies within occupational settings aimed at supporting people to either remain in, or return to, employment.

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Keywords : TRiM Advisory Service, Hostage Situations, Advanced Mentoring Skills, TRiM Training course

Description : March on Stress provide psychological counselling, ability to understand PTSD, and Trauma Management (TRiM)