Article | May 13, 2026
Dr. McLean brings industry‑leading biomechanics and wearable technology expertise to Secretariat, strengthening the firm’s ability to address complex, technology‑driven disputes.
Gareth McDermott specialises in the assessment of complex claims, of varying size and complexity, involving valuation and measurement, delay, disruption, acceleration, variations, defective works, and termination claims. He has worked in a variety of sectors including building (hotels and five-star resorts, hospitals, schools and university campuses, shopping malls and residential developments), civil engineering and infrastructure projects (highways, airports and tunnelling), offshore oil & gas facilities, marine, energy, and process works.
Gareth has almost 20 years of experience on major international construction, engineering, and energy projects worldwide, including in Ireland, the United Kingdom, mainland Europe, South America, the Middle East, Asia, Australia, and Africa.
Mr. McDermott commenced his career working with contractors across the project life cycle including procurement, contract administration, interim payments and valuations, preparation and defense of contractual claims, final account preparation, negotiation, and agreement.
Mr. McDermott is regularly appointed as a quantum expert on domestic and international construction, engineering, and energy disputes. He has been instructed as quantum expert through all stages of litigation, arbitration, adjudication, and mediation matters.
Lexology Index (formerly Who’s Who Legal) recognizes Mr. McDermott as a “Global Leader: Construction Expert Witnesses – Future Leaders” and “Global Leader: Experts – Construction – Quantum, Delay & Technical – Future Leaders” with some of the client quotes published about Mr. McDermott including:
- “Gareth is an exemplary expert witness in the field of quantum”
- “His preparation is thorough and meticulous, ensuring that every detail is carefully examined”
- “His ability to delve deeply into complex topics and provide comprehensive insights is truly commendable”
- “Gareth McDermott earns endorsements for his “strong knowledge in both subcontracting and main contracting matters” which he draws upon to produce “top-quality work”.”