Our team

Sarah Barclay: Director and Founder


Sarah is the founder of The Medical Mediation Foundation, She is an accredited mediator and also Co-Director of The Evelina Resolution Project, which provides mediation and conflict management training to clinical and non-clinical staff at the Evelina London Children’s Hospital.

In 2014 Sarah was voted an “NHS Innovator” by The Health Service Journal for her work on the Evelina project.

She has a Masters degree in Medical Law and Ethics from King’s College London and is a former award winning BBC social affairs presenter. In 2018, The Medical Mediation Foundation won Mediation Programme of the Year in the National Mediation Awards for its work on the Evelina Resolution Project.


Oscar Mathew: Director


Oscar is a qualified barrister and mediator. He specialises in clinical team development, facilitation and workplace conflict resolution, helping teams to engage with difficult issues and bringing a balance of voices to a room.

Oscar is a former Senior Legal Adviser to the General Medical Council. He was involved in setting up a pioneering facilitated meeting pilot programme for the GMC called ‘Meetings With Doctors’. This involved meeting with doctors under investigation by the GMC in order to try to help them best respond to the allegations against them.


Clair Dicker: MMF Admin Manager

Clair Dicker

Clair runs the MMF office, dealing with enquiries, managing finances, organising training and liaising with clients. Organising people and projects is Clair’s speciality. Before working with MMF, Clair spent many years working as a senior PA to members of the executive team at BBC News and Radio One. Before that she worked in BBC Training, organising training for BBC journalists, scheduling courses and producing evaluation and monitoring reports for departmental budget holders.


MMF Associates

Claire Macaulay: Mediator, trainer and conflict coach


Claire is an accredited mediator, trainer and executive coach. She qualified as a doctor from Liverpool University in 1999 and trained in Medical Oncology in Glasgow, picking up an MD along the way. She currently works as a Speciality Doctor in breast cancer at the Beatson West of Scotland Cancer Centre.

Claire spent 10 years as a Medico-Legal Advisor with the Medical Defence Union, supporting and defending doctors during the most difficult time in their professional lives. A passionate educator and facilitator, Claire is an accomplished, highly sought-after trainer and public speaker, specialising in advanced communication skills. Claire is the National Education Lead for Realistic Medicine, advising the Scottish Government on the educational strategy for the implementation of Realistic Medicine. She is convinced that compassionate communication can transform relationships and resolve even the most intractable disputes.


Esse Menson: Mediator, trainer and conflict coach


Esse became a consultant paediatrician in 2006 and accredited mediator in 2014. She gained a PhD in vaccine development research in 1989 before qualifying as a doctor from Bristol Medical School in 1994 then training in Melbourne, Australia and South East England to specialise in Infectious Diseases & Immunology. In 2012, she helped develop the Evelina Resolution Project with MMF while she was a consultant at the Evelina London Children’s Hospital.

Esse is one of the principal trainers working with MMF to deliver training and coaching in understanding and managing conflict to multidisciplinary health and social care professionals around the UK and internationally. She mediates conflicts in healthcare and workplace settings. Esse has been a course director for the Guy's & St Thomas' MRCPCH Clinical Examination Course in London since 2012 and is certificated in Compassion Training from the Centre for Compassion and Altruism Research and Education, Stanford, USA (2019) and Mindful Self Compassion Training (Kristen Neff/Christopher Germer model), London, UK (2019).


Clare Sieber: Mediator, trainer, GP

Clare is a practising GP in West Sussex with a clinical interest in reproductive and sexual health. She qualified as a doctor from the University of Glasgow in 2009, and started working for Local Medical Committees, the statutory organisations that represent, support, and advise NHS GPs in 2016.

She subsequently gained a law degree from the University of Law and then became a CEDR-accredited commercial and workplace mediator so that she could pursue her passion of supporting GPs, Primary Care Networks and GP practice teams to resolve their disputes and interpersonal difficulties. She also delivers dispute resolution training to primary care staff.


Arabella Tresilian: Mediator, trainer and conflict coach


Arabella is a CEDR-accredited mediator and conflict resolution trainer, specialising in health and social care. She is a fellow of the Q Community, the quality improvement initiative of the Health Foundation and NHS Improvement and serves as a Patient and Public Involvement adviser to the National Institute of Health Research’s Research Design Service. Arabella is also a Mental Health First Aid trainer with extensive experience of training private and public sector employees in preventing health-associated disputes and holding effective mental health conversations.

Using her lived experience as a patient and carer, combined with twenty years experience as a management consultant and educator, Arabella supports service providers, businesses, boards, hospitals, families and individuals in finding effective resolutions to complex disputes and relationship-breakdowns in health and social care settings. She has been featured as an advocate for positive mental health and autism awareness on BBC Radio 4’s Inside Health, the Financial Times, the British Medical Journal, Good Housekeeping and the King’s Fund.


Anne Gordon: Mediator and coach

Anne Gordon

Anne is a consultant paediatric occupational therapist and executive coach, and became an accredited mediator in 2021. Anne is the Allied Health Professionals Lead for Children and Young People at NHS England and currently Chief of Allied Health Professionals at Evelina London Children’s Healthcare (Guy’s and St Thomas’ Hospitals NHS Foundation Trust).

Anne undertook undergraduate training in Australia, and has worked clinically and in clinical research in the UK, Australia, Kenya and India. She has a PhD in children’s neuroscience from the University of Melbourne. At Evelina London Children’s Hospital Anne co-developed training with the Medical Mediation Foundation to improve communication between staff, in particular focusing around building trust and having difficult conversations.



MMF Australia Associate

Susan Macnaughton: Mediator, trainer and conflict coach.


Susan Macnaughton is an English and Hong Kong qualified solicitor who spent her legal career divided between London and Hong Kong. After becoming a partner in international firms Sinclair Roche & Temperley and Stephenson Harwood, she took a break from the law to start a family and qualify as a mediator and CEDR trained negotiator. In 2010 she joined boutique dispute firm, Gall Solicitors to head their mediation practice where she mediated a wide range of commercial and family disputes.

Since moving to Melbourne with her Australian husband in 2016, Susan has started her own mediation and conflict coaching firm, Dispute Logic. She is an accredited (Hong Kong and Australia) commercial and family mediator, and an Accredited Family Dispute Resolution Practitioner. In Australia, Susan has continued to mediate a mix of commercial and family matters. She is also a training coach for the Australian College of Law and Bond University family dispute resolution programmes.

Through her work with families Susan has seen how mediation can transform very difficult and emotional situations by removing the assumptions and misunderstandings which have driven conflict. Having observed how poor communication and lack of trust can impact families with sick children (or other family members), she has realised how important mediation is in the health field. Susan has become a passionate advocate for mediation between health teams and families, and for the availability of conflict training to health professionals. She currently provides conflict coaching to Royal Children’s Hospital in Melbourne to help staff identify cases where difficulties may have arisen and develop strategies to manage those cases in a way that supports the health team and the family.

MMF Affiliates

Lisa Leppard


Lisa is an accredited mediator and works as the Family Care Sister on the Neonatal Intensive Care Unit at Southampton Children’s Hospital. As part of her role, she facilitates informal mediation between parents and staff with early identification of communication concerns between the two. By building trusting relationships with all concerned, Lisa maintains ongoing relationships during challenging periods.

Lisa is also a Palliative Care Lead Nurse for the Thames Valley and Wessex Neonatal Network and was a contributor to the recently updated Together for Short Lives, Neonatal Palliative Care Pathway. She is an experienced trainer and works with Child Bereavement UK to deliver training days on Baby Loss and with The Medical Mediation Foundation teaching mediation skills for health professionals.


Georgina Rowley

Georgina Rowley

Georgina is an accredited mediator and a practising solicitor based in the North West. She has practiced in the field of health law since 2001 and has had a Court of Protection practice since the Court's inception. She was a partner at health law firm Hempsons where she conducted many cases concerning the withdrawal and continuation of life sustaining treatment, serious medical treatment disputes and many other medical cases including the donation of bone marrow from incapacitated patients.

Georgina is a member of the Court of Protection Practitioner’s Association and currently practices with Hugh Jones Solicitors acting for vulnerable people in Court of Protection placement, care and treatment disputes. She regularly lectures to health and social care professionals on mental capacity law and has been influential in promoting the use of mediation in the Court of Protection.