Dunn and Ellis


The firm currently has two partners – Sion E Roberts and Iorwerth Ll Williams – and a very strong and experienced team of qualified staff.
Information on the Partners can be found below, while the background information and contact details for other members of staff can be found in the dedicated Staff Profile page.



Sion E Roberts:

Having commenced employment with Dunn & Ellis in 1988, Sion qualified as a Chartered Tax practitioner in 1999, entering into the partnership in 2001.

Sion specializes in the taxation of individuals and companies, having a particular interest in the taxation issues specific to the rural economy.


Iorwerth Williams



Iorwerth Williams ACA –

Iorwerth commenced working for Dunn & Ellis in March of 2007 after completion of his Chartered Accountancy qualification with Deloitte in Cardiff and London.

Iorwerth graduated at the University of Wales Aberystwyth after studying Agriculture and Business Studies.

Iorwerth became a partner within the practice in February 2010.