Reuben McGregor-Sumpter

Associate, London

Biography

Overview

Reuben McGregor-Sumpter is an associate in the London office, practising in the International Arbitration and Construction and Engineering Groups. He has a broad practice in international arbitration and commercial litigation, advising on international construction and commercial disputes across a range of industries, including oil and gas, primary infrastructure and tech.

Reuben joined White & Case in 2020 as a graduate in the Sydney office, where he practiced in the Commercial Litigation Group, before transferring to London in 2025.

Bars and Courts
Barrister and Solicitor of the High Court of New Zealand
New South Wales
Education
LLB (Hons)
Bachelor of Health Sciences
University of Auckland
Languages
English

Experience

A State-principal entity advancing claims against contractors relating to defects in a large infrastructure project in Sydney.

A large contractor advancing scope of work, extension of time and delay cost claims against a State-principal entity relating to the construction of a high school in northern New South Wales.

A client on defending claims made from downstream parties and making claims against upstream parties in relation to the $2.2 billion Sydney Light Rail Project, regarding scope of works disputes and delays. 

A Canadian fund manager in M&A litigation in the Supreme Court of New South Wales.

An insolvent German bank seeking recovery under Australian insurance policies in the Federal Court.

Twitter in a number of matters, including defending an application by Avi Yemini in the Federal Court, and defending an application made by the Australian Muslim Advocacy Network in the Queensland Human Rights Commission and Queensland Civil and Administrative Tribunal.

Hornsdale Power Reserve, owner of the ‘Tesla Big Battery’, in civil penalty proceedings with the Australian Energy Regulator.

An infrastructure investor in defects claim in the New South Wales Supreme Court against the head contractor.