The Mahon Sweeney Team

Sean MahonSean Mahon

Sean is the managing Partner in the practice and is an experienced Litigator with more than 25 years’ experience in Courts, Tribunals, Arbitration and Mediation. Sean graduated from NUI Galway in 1990 and initially worked in a large commercial practice, Gerrard Scallan and O’Brien in Dublin for 3 years and in a small general practice for 3 years before moving to Roscommon to set up his own practice, Sean A. Mahon & Co. He developed a niche business in commercial law and litigation. He has been a Vice-Chairman of the Employment Appeals Tribunal for over 10 years, which has given him an opportunity to develop his interest in Employment Law and Industrial Relations in general. Also it has given him a unique insight into Employment Law in practice and informs his advice to clients.   Sean is currently the President of Roscommon Chamber of Commerce. 

Marie ConroyMarie Conroy

Marie graduated from NUI Dublin in 1987 and worked in one of the largest commercial law firms in the country, Mathesons Solicitors for 4 years before moving to Donegal where she worked for 5 years in a general practice. Subsequently she moved to Longford where she worked as a litigation Solicitor before becoming a Partner in Farrell McDonnell Sweeney. Marie is a Partner in Mahon Sweeney and practices primarily in Defence Litigation and Family Law. She has a wealth of experience in all areas of Litigation and dispute resolution representing clients before the District, Circuit, Higher Courts. Marie has extensive experience in all aspects of Family Law and deals with a wide range of cases including Separation, Divorce and non marital/co-habitation cases together with ancillary work relating to access, maintenance, custody, pensions and property related work. She is also very experienced in all aspects of Property Transactions. In addition to being a member of the Law Society she is also a member of the Dublin Solicitors Bar Association and is the former President of Roscommon Solicitors Bar Association.

JJohn Sweeneyohn Sweeney

John is qualified for over 40 years and brings a wealth of experience in considering and advising on the ever more complex areas of Law. He deals predominantly in Conveyancing and private client matters, including property transaction, Wills, succession rights and disputes, the administration of a deceased’s estate and family trusts. He provides practical and client focused legal advise based on his extensive experience and a clear understanding of the clients needs. He has extensive experience on all issues related to the transfer of assets by inheritance, sale or gift. John retired from Mahon Sweeney in October 2014 and we wish him all the very best in the future. 

Niamh MahonNiamh Mahon

She qualified as a Solicitor in 2001 and has worked with Seán A. Mahon & Co and Mahon Sweeney since qualification. In recent years she has taken over the job of running the Elphin Office in conjunction with Seán. She provides advice on all private client areas, including property transactions, Will’s, succession rights and disputes, the administration of a deceased person’s estate, Enduring Power of Attorney, family trusts and transfer of business. In addition she provides a litigation service and acts in debt collection matters and Personal Injury Claims.

Lorraine MileyLorraine Miley (Office Manager)

Lorraine has been office manager for both Sean A. Mahon & Co. and Mahon Sweeney for over 15 years. She is a qualified Legal Executive but got side tracked into Office Management. She is responsible for the day to day administration of the offices and co-ordinates the two offices, the Solicitors and staff.


Lorraine Feeney

Lorraine Feeney qualified as a Solicitor in December 2015 after completing her apprenticeship with Mahon Sweeney. She has a BA(Hons) in Law and Taxation from LIT.   Lorraine is extremely experienced as she has worked in Mahon Sweeney for over ten years while doing her degree and also her apprenticeship.  She deals in all areas of Law but particlarly conveyancing, debt collection and probate matters.