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Ronan Daly Jermyn

Work +353 21 480 2700
Fax +353 21 480 2790
Cork, Dublin, Galway, London

Diarmaid Gavin

Work +353 21 4802707
Ronan Daly Jermyn

Work Department

Corporate/M&A, IP, EU and Competition, and Commercial Contracts and Technology.


Diarmaid is a partner in the firm's Corporate and Commercial Department advising a range of clients in different industry sectors on a broad range of corporate and commercial legal matters. He also leads the firm’s competition law and non-contentious IP practices.

On the transactional side, Diarmaid has acted for a number of clients in the agri-food, life sciences, technology and media sectors on M&A transactions, corporate group restructurings, joint ventures and equity fundraisings. His broader commercial law practice covers intellectual property licensing, outsourcing, competition law, commercial contracts and data protection. Particular areas of expertise include State-funded multilateral research collaborative projects between the academic and industry sectors where he is an established advisor on knowledge transfer interactions between industry and the research performing community in Ireland.

Diarmaid leads Ronan Daly Jermyn’s Brexit team, a cross-departmental team that advises clients on how to prepare for the impact of Brexit and seizing the opportunities it may bring.


Prior to joining Ronan Daly Jermyn, Diarmaid worked with a “magic circle” law firm in its London and Brussels offices where he advised on merger notifications before the European Commission and the UK Office of Fair Trading (now the Competition and Markets Authority) as well as on cartel and abuse of dominance cases.


Admitted as a solicitor in Ireland.


University of Dublin, Trinity College (LLB)
Collège d'Europe, Bruges (LLM in Advanced European Law)
Oxford Institute of Legal Practice (Diploma in Professional Legal Studies)


Commercial, corporate and M&A

Within: Commercial, corporate and M&A

The members of the Ronan Daly Jermyn team are 'strong as a unit and their various areas of expertise interact well together'. The practice is noted for its specialism in the technology and life sciences sectors; practice head Gillian Keating advised SensL Technologies on its sale to ON Semiconductor, and Diarmaid Gavin acted for Agilent Technologies on its acquisition of Luxcel Biosciences. Dublin-based Bryan McCarthy, the 'technically strong' JP Gilmartin, who is based in Galway, Sinéad Corcoran and newly promoted partner Sean O’Reilly are also noted. All partners are based in Cork unless otherwise noted.

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EU and competition

Within: EU and competition

Merger control, state aid, dawn raid response and procurement are key areas of work for Ronan Daly Jermyn. Cork-based Diarmaid Gavin heads the practice; he advised Landmark Media Group on the merger control aspects of the acquisition of publishing and media interests by The Irish Times and provided state aid compliance advice to the University of Limerick. Finola McCarthy leads the procurement practice.

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Healthcare and life sciences

Within: Healthcare and life sciences

Ronan Daly Jermyn's healthcare and life sciences team stands out for its 'breadth and depth of practice' and 'knowledge of the sector and stakeholders'. In the healthcare space, Galway-based Padraic Brennan and Imelda Tierney, who are 'highly specialised and impressive', are noted for their work defending public and private hospitals against medical negligence claims, particularly in catastrophic birth injury cases. Cork-based Gillian Keating leads the life sciences side of the practice; Diarmaid Gavin advised Genesis Automation on an equity investment by a specialist investor in European healthcare; and Galway-based JP Gilmartin 'can bring an excellent efficiency to transactions'.

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Information technology

Within: Information technology

Cork-based Gillian Keating leads the technology practice at Ronan Daly Jermyn; she and Diarmaid Gavin handled a number of M&A transactions in the technology sector, including acting for Irish company SensL Technologies on its sale to US-based ON Semiconductor. In Dublin, Bryan McCarthy heads the cyber and data protection team, advising on GDPR compliance, notification of breaches, data subject access requests and other issues.

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Intellectual property

Within: Intellectual property

Ronan Daly Jermyn¬†has a ‚Äėknowledgeable, accessible and flexible‚Äô IP team, which advises a number of third-level education institutions on collaboration agreements with private sector players. JP Gilmartin¬†and ‚Äėsolution-focused‚Äô, ‚Äėeasy to work with‚Äô practice head Diarmaid Gavin¬†advised private sector clients on IP licence agreements. Darryl Broderick¬†handles IP litigation, acting in trade mark, copyright and passing-off claims.

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Public sector

Within: Public sector

Ronan Daly Jermyn specialises in advising on statutory obligations, public procurement, data protection, complex medical negligence claims and data protection. In Cork, Finola McCarthy assists with public procurement and administrative law issues, and Diarmaid Gavin advises on EU competition and state aid matters. In Galway, Padraic Brennan and Imelda Tierney focus on the defence of medical negligence actions. Clients include Cork County Council and the State Claims Agency.

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