Senogles & Co, Chartered Accountants was first established in 1925 in Bangor, North Wales by Harold Senogles.  In 2025, we were proud to celebrate our family firm’s centenary year.

Our firm's original focus in the 1920s to 1940s was on accounts preparation and taxation advice to North Wales individuals, businesses and farmers located on the beautiful Isle of Anglesey (Ynys Môn) and in Caernarfonshire.  Steady progress was made from offices in Arvonia Buildings, Bangor and the practice grew in terms of clients and staff numbers - and reputation.  

In 1948, on his return from active service in India and Palestine with the British Army and Indian Army, David Senogles joined the practice as an articled clerk.  Gradually, David took over the running of the practice from his father Harold and a smooth handover passed the baton from father to son. Our clients and our personal level of service were (and still remain) our main focus - we are a small firm by choice.

In 1980, Senogles & Co relocated away from the Welsh mainland, over the famous Thomas Telford suspension bridge to Ynys Môn (Isle of Anglesey), into offices in Menai Bridge - right next door to the Menai Suspension Bridge (shown below is a view from Ynys Môn of the suspension bridge over the Menai Straits with Eryri in the background [in English, the mountains of Snowdonia]).

On the sudden death of David Senogles in 1985, the family practice was sold to local accounting practice Cecil Williams Denton & Co.; itself a well established and respected firm in Bangor.  During the early years of this transition, both Geoffrey and his sister Delyth worked in the firm - which now trades as Willams Denton. 

In late-2017, Geoffrey Senogles and his partners revived the family firm - by now located in Nyon near Geneva, Switzerland.  By choice, we are truly international in our thinking, our worldview and our client base and we deliberately choose to be a boutique firm. We have no interest in any big firm “KPIs” (i.e., the dominant metric being fee revenue, full stop). Rather, we remain focused on our clients. We remain based near open water among beautiful landscape and we still look out over mountains (below: a view from Nyon looking out across Lac Léman and the Alps).   

Steve Brookfield and Geoff Senogles first met in 1997 when both working as managers in Pannell Kerr Forster, chartered accountants in Liverpool, UK.  Claire Ashby, another experienced chartered accountant joined in 2022.              

Senogles & Co is a trading name of The GAPconsultancy sàrl, a Swiss limited company established in 2003 by Sharon and Geoffrey Senogles, plus Steve Brookfield (Swiss federal ID and TVA no. CHE-110.298.534).