Prior to founding Three Crowns LLP, Constantine led the international arbitration practice of a leading international law firm in London. He has appeared as counsel on some of the largest commercial arbitrations of the last decade, relating to the energy, telecommunications and satellite sectors. Most recently, Constantine has been lead counsel for commercial clients in claims against sovereigns and state entities in Indonesia, Algeria and Kazakhstan, and led a team that obtained a final award for a client against the Nigerian National Petroleum Company in excess of US$2 billion. Constantine has also advised and represented a variety of investors and states in relation to disputes under relevant bilateral and multilateral investment treaties, and was counsel of record in high-profile ICSID successes for the Republic of Kenya in World Duty Free v. Republic of Kenya, and for the Republic of Lithuania in Parkerings v. Republic of Lithuania.
Constantine has been named as one of the ‘top 20’ individuals in the world of arbitration in the 2011, 2012 and 2013 ‘Who’s Who’ of Commercial Arbitration. He is a co-author of the fourth and fifth editions of the leading textbook on international arbitration, Redfern and Hunter on International Arbitration, and the news editor of the leading journal International Arbitration Law Review. He is a solicitor-advocate (Higher Courts Civil), and was recently appointed Queen’s Counsel.