Jason O’ Sullivan

Jason O’ Sullivan

The principal and founder of J.O.S Solicitors is Jason O’Sullivan, B.A., LL.B., Cert. Compliance.

Award Winning Solicitor: 

Jason was named “Lawyer of the Year” 2023 at Irish law Awards on 9th June 2023.

Jason was previously awarded “Connacht/Ulster Sole Practitioner of the Year” at the Irish Law Awards 2021 and was also  “Connacht/Ulster Sole Practitioner/Sole Principal of the Year” at the Clinch Wealth Management Irish Law Awards 2018.

Professional Experience:

After qualifying as a solicitor in Ireland in 2007,  Jason practised for a number of years as an Associate Solicitor, specialising in Employment Law, Company Law, Commercial and Civil Litigation.

Combining his skill and passion for law and politics, he then paved out a successful career in Public Affairs, before opening up his own law practice J.O.S Solicitors. During his time in Public Affairs, he worked both in the corporate and the not-for-profit sector, gaining unique experience and knowledge of these diverse environments from the legal, regulatory and policy perspectives. He also gained exceptional experience and insight into the strategic areas of Employee Engagement and Crisis Management, which complimented his legal knowledge and acumen.

Jason is also a qualified Solicitor in England and Wales, since 2010 and is an accredited Mediator of the Mediators Institute of Ireland (MII). The firm provides Mediation services nationwide and internationally as a form of dispute resolution with particular focus on civil, commercial and workplace disputes.


Throughout his career, Jason identified the need to offer clients a more customised service offering and specialised legal focus, delivered in a more personable and pragmatic fashion. It was these motivating factors, which led to the establishment of this specialist law firm and it is on these values, that the firm achieve its results.


  • Holds a primary Bachelor Degree in Law, Sociology and Politics from the National University of Ireland, Galway (N.U.I.G)
  • Holds a postgraduate Degree in Law (L.L.B), from NUIG
  • Studied law at the prestigious University of Southern Maine Law School, USA and at the Katholieke University, Leuven, Belgium
  • Accredited Mediator in Dispute Resolution, from the MII.
  • Holds a Professional Certificate in Compliance from the Institute of Banking and University College Dublin (UCD)
  • Holds a Certificate in Arts, Entertainment and Media Law from the Law Society of Ireland.
  • Holds a Certificate in Employment Law & Remote Working from Law Society of Ireland.
  • Holds a Certificate in Technology Law from the Law Society of Ireland.
  • Holds a Certificate in Environmental Law & Climate Change from Law Society of Ireland.
  • Diploma in Marketing Communications.


  • Law Society of Ireland
  • Law Society of England & Wales
  • Mediators Institute of Ireland (MII)
  • Association of Compliance Officers in Ireland (ACOI)
  • Legal Counsel with Junior Chamber of Commerce International Galway.


Jason also regularly contributes to media interviews and debates on various legal and policy topics. He has had numerous articles and opinion pieces published in the national and regional press, and in particular with The Irish Independent and The He has also been made appearances on national TV and in particular RTE’s News One ,  Six One News and RTE’s Campaign Daily, including guest appearances on various national and regional radio shows, such as RTE’s Morning Ireland and Newstalk.