John Marrin KC > The Chambers of Alexander Nissen KC > London, England > Lawyer Profile

The Chambers of Alexander Nissen KC
Keating Chambers
John Marrin photo


John Marrin KC  specialises in construction, engineering and energy-related disputes.  His experience also extends to various other technical fields such as computer software, rail and supply disputes in the oil and gas sector.

John Marrin has practised from Keating Chambers for over 35 years.  He served as Head of Chambers from 2005 to 2010. Until 2017, he represented a wide variety of clients in the High Court, the Court of Appeal, the House of Lords and the Supreme Court in England and before various other domestic and international tribunals.

He is a former Recorder of the Crown Court and a former Deputy High Court Judge, sitting both in the Queen’s Bench Division and in the Technology and Construction Court.  He is a Chartered Arbitrator and a Fellow of the Chartered Institute of Arbitrators and he is named on various arbitration panels internationally.  John Marrin has long experience of acting as an adjudicator and as a mediator. He is a TECBAR Accredited Adjudicator and a CEDR Accredited Mediator.

John Marrin now practises primarily as an Arbitrator.


Called to the Bar – Inner Temple 1974, Queen’s Counsel 1990, Assistant Recorder of the Crown Court 1993, CEDR Accredited Mediator 1993, Recorder of the Crown Court 1997-2014, Deputy Judge of the Technology and Construction Court 1997-2014, Fellow – Chartered Institute of Arbitrators 1998, Bencher of the Inner Temple 2002, Deputy High Court Judge 2008-2014


MA in Law – Magdalene College, Cambridge 1973

Lawyer Rankings

London Bar > International arbitration: arbitrators

(Leading arbitrators)Ranked: Tier 1

John Marrin KCKeating Chambers ‘He is an outstanding arbitrator who is regularly appointed in construction and energy arbitrations in many parts of the world. John is patient, diligent and an extremely good lawyer.’

Keating Chambers is a ‘top construction set’ with ‘a number of outstanding arbitrators who are regularly appointed as tribunal members‘. Construction, infrastructure and energy dominate the agenda for the set’s full-time and part-time arbitrators who have extremely good credentials for arbitrating disputes in Europe, the Middle East, Africa and Asia. Many of the set’s full time arbitrators were previously distinguished counsel in their own right, including Robert Gaitskell KC, John Marrin KC  and Marcus Taverner KC. Coupled with this is a deep bench of practicing barristers, including Veronique Buehrlen KC, Richard Harding KC and head of chambers, Alexander Nissen KC.

Asia Pacific - The English Bar > Construction, energy and infrastructure

(Leading Silks)Ranked: Tier 1

John Marrin KC – Keating ChambersA giant of the field.