We are incredibly grateful for all of the support we receive from our trustees.

Andy Seferta

Chair of Trustees and Business Development 

Tonia Ball
I joined as a non-exec trustee in 2013, then as full trustee from 2014 and am now very proud to be the Chair of Trustees at The Joshua Tree.  I feel privileged to be able help the charity achieve even more, as we grow and evolve.

Since graduating with BSc and MSc degrees from Leeds University in the 1990s, I have held a variety of senior business roles in the IT sector with Fujitsu.

I am married with three children, love watching and playing snooker, and am an avid Aston Villa fan.

Tonia Ball

Deputy Chair of Trustees & Legal

Tonia Ball
I was introduced to Lynda and Dai in 2012 when my eldest son was recovering from a bone marrow transplant to treat a rare blood disorder.

I could see immediately that The Joshua Tree’s support service for families affected by childhood cancer was invaluable. From my own experience, I know what it is like to receive a diagnosis and have your world turned upside down, to feel isolated from “normal” life, to watch your child endure chemotherapy and all its side effects, to see years of what should be their carefree childhood taken from them by the disease and to see the effect, not just on them, but also on their siblings and other family members. Whilst the medical profession do an amazing job taking care of the patient, The Joshua Tree take care of the whole family, both during and after treatment.

Before having children, I worked as a corporate lawyer and now I’m delighted to be able to use that legal background in my role as one of the trustees of The Joshua Tree.

Martin Keelagher

Income Generation

Tonia Ball
It is a great privilege to be invited on to the board of such an important children’s cancer charity, being something very close to my heart. The challenge of ensuring that ever individual touched by children’s cancer, can access the support they require for all members of their family affected, for as long as needed, is a challenge that we shall tackle head on. I am very much looking forward to helping to support this incredible charity, with this essential mission, as we move forward.

I am a serial entrepreneur and hold board positions in businesses engaged in Venture Capital, Perimeter Security solutions, Automating the workforce (RPA), Technology Support, FinTech, InsurTech, Insurance Claims Management, Health and Leisure, Events, Consultancy, Trade Federation and Family office.

Dr Susan Gilby

Clinical & Strategy

Tonia Ball
Having graduated in both music and medicine at Manchester University, I then completed my postgraduate medical training in Manchester and Liverpool.

I first worked at The Countess of Chester during my specialist training, having previously worked as Medical Director at Wirral University Teaching Hospital NHS Foundation Trust and Wye Valley NHS Trust and as Associate Medical Director at Mid Cheshire Hospitals NHS Foundation Trust. I was a consultant in anaesthesia and intensive care medicine at Mid Cheshire NHS Foundation Trust and at the Liverpool heart and Chest NHS Foundation Trust.

I joined The Countess of Countess in August, 2018 as Medical Director before becoming Acting Chief Executive in October 2018 and then the substantive Chief Executive in April 2019.

I have lived with my husband and three children in Mid Cheshire for 28 years.

Follow Susan on Twitter: @GilbySusan

Paula Byrne

Legal & HR

Tonia Ball
I am a solicitor with over 35 years experience in employment law working with employers in both the public and private sectors across a range of industries.

I am now retired from legal practice and I joined the Joshua Tree as a Trustee in March 2022.  I am delighted to have the opportunity to  use my legal  knowledge and experience to help and support the team at The Joshua Tree.

Dr John Archer


Tonia Ball
I was recently appointed the Head of Radiotherapy Services at The Christie NHS Foundation Trust, after helping to setup the UK’s first high energy proton beam therapy (PBT) service over the last three years.

For much of my career I have been a Medical Physicist, completing a PhD at the University of Liverpool in 2008, before going on to work across a range of healthcare settings.  Through my work within the PBT service, I have not only been at the heart of developments in paediatric radiotherapy, but has witnessed first-hand the wider impact childhood cancer can have on a family.

Tracey Harrison

Oncology Lead

Tonia Ball
I qualified as a Registered General Nurse in 1991 and on completion of my training I worked on a general medical ward with children.

In 1993 I qualified as a registered children’s nurse and continued to work in general medicine.

In 1995 I began to work on the children’s home care team and in 1991 took a Children’s Community Specialist Practitioner BSc degree. During this time I worked extensively with families who have children with oncological conditions, this has included children both during and at end of life care.

In 2017 I became the lead nurse for the local hospital for children who have an oncology diagnosis which involves working in conjunction with the Primary Treatment Centres to deliver continuity in care for these families.

My involvement with The Joshua Tree began when I was fortunate enough to be one of the team of nurses who cared for Josh and his family at home. I hope that my experience and knowledge enable me to be able to support the staff working at The Joshua Tree.

Diane Halsey ACIS

Governance and Compliance

Tonia Ball
A Chartered Secretary with over 35 years experience as Company Secretary and Director in both the public and private sector across a range of industries including construction, manufacturing, supply chain management, higher education and the NHS.

Now retired, I am enjoying spending time with my three young grandchildren but good governance remains my passion and I continue to provide some professional coaching and mentoring in this area.

David Perrin


Tonia Ball
I joined the charity as a Non-Executive Trustee in 2019 and a Trustee in 2021 having held positions on several Senior Leadership Teams.

My professional background is in both Business Development and Operations in the property and asset management markets where I have been responsible for multimillion pound business areas.

I am especially excited to assist the charity progress further now that the Support Centre is built and operational.

Nerys Price-Jones


Tonia Ball
I feel deeply privileged to join The Joshua Tree as newly appointed Trustee.

As a family we were first introduced to the amazing work that the Joshua Tree does whilst on Ward 3B at Alder Hey Hospital back in early 2019.

Our world was completely and utterly turned upside down when our son was diagnosed with a Brain Tumour in May 2019.  The Joshua Tree supported the whole family during treatment and continue to do so now.  They have been a vital source of support and comfort for us all.  Also, critically for me, as a Mother with such a critically ill innocent defenceless child, The Joshua Tree gave me hope when I needed every ounce I could grasp.

A little bit about me – I am married, and we live just outside Ruthin in North Wales with our 2 children.  I have always worked in HR from leaving University and have worked in different industries from manufacturing to construction and pharmaceutical. Chartered Fellow member of the CIPD, my experience to date covers every aspect of a generalist HR role with the last 20 years plus in Senior HR Management positions.

What is important to me and why I chose a career in HR is people. I want everyone to feel proud and secure in work and to ensure that we are all given the opportunity to do and be the best that we can in our roles. Having experience the life changing event in May 2019 this ethos now filters into every aspect of our lives and purpose.

I am thrilled to join the talented team at the Joshua Tree and hope to be able to give a little something back to a much deserving charity.