Regan studied at Pembroke College, University of Oxford, where he completed the academic work associated with a Master of Arts degree. His professional qualification followed in England in 1980, establishing the legal foundation for a career focused on construction, engineering, insurance, and international dispute resolution.
Regan began his legal career in London and became a partner of Rowe & Maw, where he developed a practice in construction and engineering disputes. After the 2002 combination of Rowe & Maw with Mayer Brown, he continued as a partner of Mayer Brown International and became head of its London construction and engineering group. His practice has covered complex disputes arising from power stations, nuclear facilities, bridges, dams, process plants, refineries, buildings, roads, mining projects, and other infrastructure projects. He has represented contractors, developers, insurers, engineering consultants, and other project participants in English court proceedings, domestic and international arbitrations, adjudications, mediation, and other forms of alternative dispute resolution. His international arbitration work has included proceedings under the rules of the London Court of International Arbitration, the International Chamber of Commerce, and the International Centre for Settlement of Investment Disputes. He has also advised on construction insurance, risk allocation, procurement strategies, and major forms of construction and engineering contracts, including FIDIC forms. Regan is a solicitor-advocate with higher rights of audience in the civil courts of England and Wales. Companies House records show that his membership of Mayer Brown International LLP ended on January 1, 2026.
Led Mayer Brown’s London construction and engineering group and developed a practice handling major construction, engineering, insurance, and infrastructure disputes across domestic and international forums.
Represented clients in more than 20 reported cases and in complex international arbitrations involving construction defects, delay, disruption, project insurance, and engineering claims.
Regan has been associated with the Chartered Institute of Arbitrators, the Society of Construction Law, and the International Bar Association. He also served as a working member of the Turnkey Heavy Plant Subcommittee of Committee T of the International Bar Association.
Professional association connected with his practice in arbitration.
Chartered Institute of Arbitrators , United Kingdom
Professional association for construction-law practitioners; Regan received its Hudson Prize in 2014.
Society of Construction Law , United Kingdom
Served as a working member of the Turnkey Heavy Plant Subcommittee of Committee T.
International Bar Association , International
Professional assessments have described Regan as measured, calm, commercially aware, technically astute, and reassuring in complex disputes. Legal directories have also highlighted his clear, pragmatic advice, sound judgment, and extensive experience.
Quotes from others about the person
Legal directories have recognized Regan as a leading construction and engineering lawyer and have praised his commercial awareness, technical knowledge, judgment, and ability to handle complex domestic litigation and international arbitration.
