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, many of which relate to the energy sector. Most recently, Constantine has been lead counsel for commercial clients in claims arising under production sharing contracts against sovereigns and state entities in Algeria, Nigeria, the Kurdistan Region of Iraq and Kazakhstan. He has recently led teams that obtained a monetary award for clients against the Kurdistan Regional Government for $1.98bn, and a final award for a consortium of clients against the Nigerian National Petroleum Company in excess of $2bn. 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, 2013, 2014 and 2015 “Who’s Who” of Commercial Arbitration. He is a co-author of the fourth, fifth and sixth editions of the leading textbook on international arbitration Redfern and Hunter on International Arbitration. He is a solicitor-advocate (Higher Courts Civil), and was recently appointed Queen’s Counsel.
Constantine was educated at King’s College, London and Cambridge University.
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