On 12 June 2014, Lewis was appointed as Queen’s Counsel in Gibraltar.
Lewis read law at King’s College, London and at the Inns of Court School of Law. He was called to the Bar of England and Wales and the Gibraltar Bar in 1986 and joined the firm that year. He became a partner in 1993 and Head of Litigation in 2003.
His practice over the years has been wide-ranging, with a strong emphasis on international commercial disputes, maritime law and administrative law.
He has been involved in many of the leading Gibraltar cases in these areas over the past 25 years, acting for a wide range of local and overseas clients, including private individuals, corporations, Banks, Trustees, accountants, local and overseas state authorities as well as international organisations. Many of his cases are reported in the Gibraltar Law Reports.
He has also appeared as Counsel in cases of European significance in the European Court of Human Rights and the Privy Council, such as Bols v Superior Yacht Services  UKPC 45, a leading case on jurisdiction agreements in a EU context and, more recently, in French v Public Prosecutor of Central Department of Investigation and Prosecution in Lisbon  UKPC 16 concerning the EU Framework Decision on the European Arrest Warrant.
Lewis holds a number of public appointments in Gibraltar, including that of Chief Charity Commissioner and Chairman of the Mental Health Review Tribunal. He also sits as an ad hoc Chairman of the Industrial Tribunal.
He is consistently ranked as a “Leading” or “Band 1” litigator by major international lawyer directories and is commended for his “hands on” approach to cases. In the 2013 Legal 500 section on Gibraltar a source described him as being “every bit as good as his counterparts in London.”