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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We also work with expert clinical associates, our clinical associates 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 Matthew Gould, DClinPsych

Consultant Chartered Clinical Psychologist

Dr Matthew Gould is a Consultant Chartered Clinical Psychologist with international, public and private sector experience of assessing and managing psychological risk and health in hazardous settings. Matt has particular expertise in leading on psychological governance to ensure organisations meet their Duty of Care and regulatory obligations. Matt has completed advanced training in workplace threat assessment which seeks to identify and manage vulnerable employees with a grievance that present as a serious threat.

Matt has extensive experience of occupational mental health having provided clinical risk assessments at selection (‘role-fit’) and for special issuance medical certification (‘pre-existing vulnerability’) for personnel employed in challenging roles. He has worked for the UK Armed Forces providing occupationally-focused mental healthcare and been a consultant psychologist on a range of specific risks for specialist military programmes such as hostage survival training and exposure to graphic content. He has extensive experience of working with trauma and other mental health disorders especially those arising within an organisational context. Matt is a registered practitioner psychologist with the British Psychological Society (BPS) and a full member of the Division of Clinical Psychology.

Matt has extensive experience working in the aviation sector. He was the Head of Clinical and Aeromedical Psychology for Emirates Airlines and a designated Aviation Medical Examiner (AME) in Psychology. In this role, based in Dubai, Matt designed and delivered a global clinical psychological risk and wellbeing strategy for Emirates Airlines. Matt was also a member of an expert advisor group following the tragic Germanwings Flight 9525 air accident in 2015. The clinical risk assessment guidelines that Matt developed for Emirates Airlines continue to be used by the United Arab Emirates aviator regulator as best practice. Matt has also managed survivors following a major aircraft accident and consulted on contingency planning to an airport ground handling provider following a terrorist attack. Matt is an accredited aviation psychologist with the European Association for Aviation Psychology (EAAP).

As well as having completed specialist training in aviation neuropsychology and addictions management, Matt has extensive experience of applying cognitive psychology to treat a wide range of psychological conditions as well as to improve decision-making and performance in leadership and challenging settings. Matt has worked with a number of major organisations as a consultant and coach including providing resiliency coaching to senior staff of a major UK bank. He also consults to the Criminal Injuries Compensation Authority (CICA) on disabling mental injury as a result of violent crime and terrorism.

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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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Glyn Reynolds

Glyn Reynolds is a BABCP accredited Cognitive Behavioural Therapist, working with people experiencing Depression or Anxiety disorders. Glyn has been working using CBT in IAPT (Improving Access to Psychological Therapies) teams since 2012, and before this time he worked to support people with a range of disabilities.

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Amos Simms

Amos Simms is a BACBP accredited CBT therapist and EMDR accredited practitioner with 28 years of military mental health experience. He currently divides his time between a research position within King’s College London and delivering out-patient evidence-based care to members of the United Kingdom Armed Forces.

Throughout his career, he has provided mental health support, health promotion and advice to senior management both in the UK and in support of military operations in Kosovo, Iraq, Kuwait and Afghanistan. Most recently, he was responsible for managing the largest community mental health team in the Armed Forces and developing the mental health delivery to that population. His current research role enables him to influence Mental Health policy, both preventative strategies and the delivery of care within the Armed Forces.

Amos initially joined the Royal Air Force and then commissioned into the Army. He has an MSc in CBT, BSc Hons in both psychology and mental health nursing and further short courses in Cognitive Processing Therapy, Compassion focussed therapy and Clinical Hypnotherapy. He is currently in the early planning stages of a PhD focussing on military trauma.

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Alex Gibson


Alex is a registered mental health nurse and an accredited behavioural and cognitive psychotherapist (BABCP) training at the University of York. He has considerable experience in treating all anxiety problems, trauma presentations including post traumatic stress, depression and drug and alcohol difficulties. He has worked in the NHS, private sector and for mental health charities, as a clinical leader, supervisor and treating psychotherapist.

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Keywords : TRiM UK Courses, Advanced Mentoring Skills, TRiM Training course, TRiM training

Description : March On Stress, a UK company providing psychological support, TRiM courses and TRiM BTEC