Revd Dr Gareth Leyshon

Hello! I’m a Catholic Priest of the Archdiocese of Cardiff, currently on secondment to the Sion Community for Evangelism.

Between 2012 and 2018, I was responsible for Evangelisation in the Archdiocese of Cardiff (South East Wales and Herefordshire), and from scratch built up a network of 150 lay Catholics keen to share faith across the length and breadth of the Archdiocese. I also started working parties focusing on outreach through our Cathedral centre, the Cornerstone, and on wider issues of evangelisation across the diocese. These projects continue, under new leadership, following my move to Sion.

I am now the only priest working full-time for the ministry of Sion, with duties including preaching on parish and school missions, training the young people serving as short term missionaries with Sion, and working as a consultant for hire to assist parishes and dioceses building up the work of sharing the Catholic faith.


I became an Associate Member of Sion on 3 September 2017, and started full time ministry for Sion on 8 January 2019.

From 19 September 2013 until 30 December 2018, I was parish priest of St Philip Evans Parish in Cardiff.

From 25 September 2012 until 19 September 2013, I was parish priest of St John Lloyd Parish in Cardiff.

Until 25 September 2012, I was priest-in-charge of St Dyfrig’s Parish in Pontypridd.

On 29 February 2012, I stepped down as Chair of the Cardiff Archdiocesan Service Team for the Catholic Charismatic Renewal in Wales, a post I held since July 2007.


In September 1999, I entered St John’s Seminary, sponsored by the Archdiocese of Cardiff to train for the Roman Catholic Priesthood. I was ordained to the priesthood on Saturday 5 May 2007. Prior to entering seminary, I spent four years researching dust in distant galaxies, obtaining a PhD in Astrophysics from the University of Wales via Cardiff University.

Originally, I come from Llanelli, where I lived until entering Oxford University in 1991, studying Physics at Keble College.

You will find me on the web at FlickrTwitter, Facebook and LinkedIn. I have been a regular contributor to the Society of St Gregory webforum and a contributor to Wikipedia but have less time to be active there now. I have accounts on Instagram and Pinterest but don’t post regularly there. You are welcome to follow some of my past personal news.