Siris a judge of the Chancery Division of the High Court of England and Wales, and since November 2013 the President of the UK Competition Appeal Tribunal (the CAT). He was called to the Bar in 1977 and became a QC in 1997, and was a leading practitioner in competition law and public law. He was appointed a High Court Judge in 2009. Sir Peter was involved in drafting the new procedural rules of the CAT concerning collective (class) actions upon the introduction of the UK regime for collective actions in competition cases under the Consumer Rights Act 2015. He chaired the tribunal which heard the first two applications to bring such proceedings and is currently chairing a tribunal hearing two more. Sir Peter held a visiting professorship at King’s College, London, teaching competition law on the LLM course, and was the general editor of the 5th and 6th editions of Bellamy & Child on European Union Law of Competition.