Has extensive experience as an expert witness, particularly on English contract law but also on English commercial law generally. He has provided evidence for courts in Spain, Germany, Switzerland, Norway, France, Iceland, a number of states in the USA, Australia, Chile and for a number of international arbitrations (ICC, UNCITRAL and LCIA). He also lectures widely for law firms on recent developments in contract law (including Herbert Smith Freehills, Bond Dickinson, Ward Hadaway, Muckle LLP, Skadden, Arps, Slate, Meagher & Flom LLP, Stephenson Harwood, Taylor Wessing LLP, and Cleary Gottlieb Steen & Hamilton LLP).
Editor of Chitty on Contracts (responsible for chapters on express terms, implied terms, performance, discharge by agreement, discharge by frustration, discharge by breach, other modes of discharge and bailment);
General editor of Lloyd's Commercial Law Library (and editor of new practitioner book on Sale of Goods);
Author of the fourth edition of Goode on Commercial Law
Author of widely used student textbooks on Contract Law (Contract Law, 11th edn, 2015 and Contract Law, Text, Cases and Materials, 6th edn, 2014)
Has written extensively in the fields of contract law, the law of restitution and commercial law.
Professor of English Private Law in the University of Oxford and a Fellow of Lady Margaret Hall. Also an Honorary Fellow of St Anne's College, Oxford.