About Us
The Practice
Mc Guinness O Neill is a modern and friendly chartered certified accountancy firm based in Buncrana, Co Donegal offering a professional, hands on accounting service to small and medium sized businesses throughout Ireland and abroad.
P.C. Mc Guinness & Associates was established in 1979 and Cathy O Neill & Co was established in 1996. The firms merged in 2001 combining a wealth of knowledge and experience and laying a solid foundation for continued expansion.
The Right Choice for Business
In striving to provide the best possible service to clients our belief is businesses should avail of and be aided by technology and not be afraid to embrace it. We try to keep things as simple as possible for you and use great technology to make life easier.
Our staff are fully trained in the latest advancements in automated accounting. The systems we use extract and organise your information in a seamless and painless integration, so you can focus on what matters. We provide a wide range of services tailormade to suit all types of businesses.
Our Team
Led by Paddy Mc Guinness and Cathy O Neill, we now have a great team of accountants and book keepers in place and a network of other professionals on hand to cater for our client needs.
Paddy Mc Guinness
Over 45 year’s experience in dealing with revenue audits & investigations, tax planning and advice.
Cathy O Neill
(FCCA) Qualified chartered certified accountant. Working in practice since 1989, senior partner in Mc Guinness O Neill. Overseeing the running of all aspects of the business.
Claire Mc Colgan
(FCCA) Qualified chartered certified accountant. Working in practice since 1998.
Tommie Caldwell
(FCCA) Qualified chartered certified accountant. Working in practice since 2001.
Maureen McDaid
(FCCA) Qualified chartered certified accountant. Working in practice since 2001.
David Doherty
(FCCA) Qualified chartered certified accountant & Master of Arts in accounting. Working in practice since 2011.
Gemma Whoriskey
ATI qualified accounts technician. Working in practice since 2001.
Myra O'Donnell
Part qualified ACCA accountant. Working in practice since 2004.
Aoife McMenamin
(ACCA) Qualified chartered certified accountant. Working in practice since 2013.
Shauna Doherty
(ACCA) Qualified chartered certified accountant. Working in practice since 2021.
Victor Izedonmwen
(ACCA) Qualified chartered certified accountant. Working in practice since 2021.
Ekant Singh
Trainee accountant. Working in practice since 2025. Currently studying towards ACCA qualification
Ciara McDaid
Trainee accountant. Working in practice since 2026. Currently studying towards ACCA qualification
Cadena McLaughlin
Involved in payroll and administration/credit control.
Margaret Powell
Working in practice since 2023. Involved in administration, accounts prep and book keeping.
Sarah Carlin
Qualified Financial Advisor, Receptionist/ Administrator.
Cathy Doherty
Payroll Technician covering all aspects of payroll.
Aaron McArt
Administrator.