Who's Who?

GISDA is a people led organisation which values its staff, trustees, and stakeholders. We believe that people are the best asset of any organisation.


All of the Board members are committed to our aims and objectives and are selected for the skills and experience that they can bring to benefit our organisation and make a difference.


Chair of the Board

Reverend Ron Williams

Ron is a Southwalian who has lived in North Wales since 1979 when he became minister at the Salem Welsh Congregational Chapel in Caernarfon. Since 2000 he is also a minister at the Congregational Tabernacle Chapel, Porthaethwy. Ron was one of GISDA’s founding members in 1985, and the only member of the original group still present on the Board. Concern for homelessness among young people in Caernarfon and the area motivated him to help form GISDA, and it is why he continues to support GISDA today. Ron is married to Rhian and together they have three children and six grandchildren.


Vice chair

Carys Thomas



Treasurer of the Board

Dewi Jones

Dewi is a senior accountant for Natural Wealth of Wales. He joined the board in 2012 and was elected as the treasurer because of his knowledge and experience. He has a keen interest in music; he plays the horn in an orchestra and a band, and he plays the accordion for folk dancing events. Dewi is originally from Llanelli but now lives in Llangefni with a wife and three sons.


Tudor Owen

Tudor is a member of Caernarfon Town Council where he is the towns mayor for the third time. He has served the town council and Gwynedd council for over 20 years and is the Vice- Chair with Noddfa, Chair with Tŷ Pobl Peblig, and is a member of several committees including the Fire Service. Before retirement he was self-employed in his own local building business. Tudor has two sons, three grandsons and a granddaughter, and he has been married for over 40 years. His interests are socialising, gardening and playing golf – although these days he is too busy to play! Tudor initially joined GISDA’s Board as Gwynedd Council’s representative. His interest in GISDA’s services sprang from his connections with the housing and care committees and his knowledge of GISDA’s good work with young people.


Ffion Jon

Ffion Jon has been a member of the board since 2016. She is a television producer specialising in projects based on rural and underprivileged communities, and she has worked on several projects with the young people at GISDA. She has recently worked on “Hen Blant Bach” for S4C and “The Toddlers Who Took on Dementia” for the BBC. She lives locally in the area and is a single mother of two. Ffion is an Everton supporter and she loves the ‘lob scows’ at GISDA’s café.


Gilly Haradence

Gilly joined GISDA’s board in 2018. She works as a solicitor at local firm Tudur Owen Roberts Glynne & Co. She has previous experience running large late night venues like Cofi Roc, Paradox and the Octagon. Having previously completed a Master’s degree in Business Administration, she’s also qualified in mediation and arbitration. Through her work she became aware of some of the challenges facing disadvantaged young people, and she is keen to support an organisation that seeks to address these challenges. Gilly loves vintage comedy radio shows, music, and watching films. She also has an old Morris 1000 convertible that she takes to the odd car show.


Elen Mai Owen

Elen Owen joined the Board in January 2019. She is a Barrister who has practised in the criminal courts of North Wales since 1988. In her spare time she helps on the family farm. She is a mother of two and is soon to become a grandmother for the second time.

Llun peter

Peter Harlech Jones

Peter grew up in north Wales and went to school in Caernarfon and went on to graduate from the Faculty of Veterinary Science at Liverpool University. He worked in veterinary practice in the UK and Canada for a number of years, after which he followed a successful career in veterinary medical research in Europe and the US. He was appointed the veterinary head of the European Commission’s Agency for the Evaluation of Medicinal Products, and subsequently chief executive of the Global International Federation for Animal Health(IFAH) and was elected president of the British Veterinary Association in 2012-13. He is now retired from full time work and runs a global consultancy in veterinary medicine and is still very much active in veterinary affairs.

He and his husband Michael returned to live in Criccieth several years ago where he was declared the High Sheriff of Gwynedd, he is a trustee on GISDA’s board and the North Wales Police and Community Trust (PACT). He now enjoys volunteering and supporting local charities in Gwynedd.

Rhys davies

Rhys Davies


Elwyn Jones

Elwyn Jones

Elwyn Jones

Management Board

Management Board


Chief Executive

Siân Elen Tomos

As a Chief Executive, Siân leads and manages the company to ensure it delivers a high quality service for vulnerable young people in North Wales. She works hard to ensure continuity in the different services we provide by applying for grants and tendering for money. She also ensures that GISDA’s performance indicators show a clear value for money in the services that we provide.

Before joining GISDA, Siân worked as a social worker for the children’s services at Gwynedd Council. She then went on to be team manager at Gwynedd Council’s service for disabled children. Siân has now been GISDA’s Chief Executive since October 2011 and we hope she continues to work with GISDA for years to come. She is originally from Deiniolen but she now lives in Caernarfon. Her interests include walking, exploring community issues and politics.

Head of Business and Development

Elizabeth George

Elizabeth joined GISDA in November 2016 as a Grants Officer and in May 2018 she was appointed Head of Business and Development. Elizabeth has a law degree from Aberystwyth University, a certificate in Governance, Compliance and Risk with the International Compliance Association, and she is studying for a diploma in Charity Law and Governance with the Governance Centre. Elizabeth is originally from Criccieth and she has lived in London, Germany, USA, and Nigeria before eventually returning to Criccieth. She loves working at GISDA and is proud to use her skills and experience to help such a worthy cause.

Head of Services

Steffan Williams

Steffan joined GISDA in June 2019 as the Head of Services. Steffan has a masters degree in leadership and management from the Cardiff Metropolitan University and has extensive experience in working in the public sector. Before joining the team at GISDA Steffan worked as a Coordinator for the Living Healthy Team with the county of Glamorgan. He is originally from Bangor and was living in Cardiff for over 12 years but has now returned to his roots in Gwynedd. He is looking forward to bringing his skills and experiences to the organisation and to help achieve GISDA’s long term goals.