Charleen O\'Keeffe

Charleen is a partner in our Disputes and Investigations Group, specialising in Intellectual Property (IP) and regulatory law. Charleen works with a wide range of national and multinational clients, from global life sciences and healthcare companies, to leading consumer goods companies. She is a recognised leader in the life sciences sector, with a particular expertise in the intersection of regulatory law, competition law and patent litigation. As a skilled litigator, Charleen brings extensive experience in guiding clients through complex Irish and multi-jurisdictional IP disputes. She advises leading global companies including innovator pharmaceutical, biotechnology, and medical device companies in high-stakes international disputes. By providing strategic local advice and representation, Charleen and her team serve as a critical component in cross-border disputes. Charleen joined Matheson in June 2026 from another large Irish law firm, where she had been a partner since 2020. Charleen advises clients in the life sciences sector on every phase of a product’s life cycle from product development, clinical trials, data exclusivity, regulatory approval to commercialisation and product safety / recall / liability. She is a lecturer on the Law Society of Ireland’s IP Diploma and PPC courses and has been recognised for several years by the leading directories for her work in Life Sciences and Healthcare and in IP. · Matheson LLP