Mark McMahon is a senior associate in Mayer Brown's London and Dubai offices and a member of the Construction & Engineering group and International Arbitration practice. His primary area of work is contentious construction, with a focus on international arbitration disputes.

Mark's experience includes predominantly international disputes involving a wide variety of projects. He has represented clients in complex high-value arbitrations and adjudication.

Mark has worked on various high profile and complex cases under different arbitration rules including ICC and ICSID and also on matters before the High Court. He has extensive experience of drafting pleadings and witness statements and has attended numerous hearings both domestically and internationally.

Mark joined Mayer Brown in 2012 as a trainee and spent six months on secondment to Mayer Brown LLP's New York office during his training contract. Mark recently spent six months on secondment to Mayer Brown's Hong Kong office and is currently based between Mayer Brown’s London and Dubai offices.

Spoken Languages

  • English
  • Irish


  • Working on two separate ICC Arbitrations in connection with major infrastructure projects in Qatar.
  • Working on an ICSID Arbitration for Kuwaiti investors against the Government of Jordan.
  • Advising on a number of ICC arbitrations in connection with the design and construction of a major maritime project in Central America.
  • Working on a multi-million pounds adjudication regarding the interpretation of a major PFI Contract.
  • Advising a leading Gulf contractor on Employer claims and non-payment.
  • Advising a leading UK contractor on issues of sub-contractor non-payment.


Kaplan Law School, LPC

University College London (University of London), LLM

University College Cork, BCL (Hons)


  • England and Wales


  • ICC Young Arbitrators Forum
  • Society of Construction Law