Viren Mascarenhas

King & Spalding LLP

Viren Michael Mascarenhas is a partner in King & Spalding’s New York office, and is a member of the International Arbitration Practice Group. He is a specialist in public international law and international arbitration, focusing on both investment treaty arbitration and international commercial arbitration.

He has nation-wide in the United States in energy disputes by Law360 (2015); Legal500 lists him as a “Next Generation” lawyer in the field of international arbitration. He was named a Finalist for the American Bar Association’s National Outstanding Young Lawyer Award in 2016. He was also named as a Future Leader in Who’s Who Legal: Arbitration 2017, an inaugural edition focused on selecting outstanding attorneys aged 45 or under, which writes that clients are “very impressed with his knowledge and intellectual abilities,” as well as Who’s Who Legal: Arbitration 2018, which writes, “He is one of the most talented, hard-working and intelligent lawyers I have had the pleasure of working with. He is a top-notch writer and is adored by clients and colleagues alike.”

Viren has acted as counsel in domestic and international arbitration proceedings held under the auspices of nearly all the major arbitral institutions, including the International Centre for Settlement of Investment Disputes, the Energy Charter Treaty, the International Chamber of Commerce, the American Arbitration Association/International Centre for Dispute Resolution, the Singapore International Arbitration Center, JAMS and ad hoc cases under the UNCITRAL Rules.

Viren has experience across a number of industries, including chemicals, consumer products and luxury goods. He has particular expertise in disputes over natural resources. His energy experience includes investment arbitrations brought against the governments of Argentina, Ecuador, Italy, Timor Leste, and Venezuela; commercial arbitrations regarding the dissolution of joint ventures, breach of supply contracts, tax disputes, and energy-related construction disputes, in matters concerning projects in Colombia, Libya, India, Russia, and the United States, and also experience in LNG gas pricing arbitrations.

His mining experience includes investment arbitrations brought against the governments of Bolivia, Peru, Uruguay, and Venezuela concerning significant mining projects.

Viren also has substantial experience in public international law, having advised or represented states, international organizations, non-governmental organizations and individuals on a wide range of matters, including maritime and territorial delimitation, law of immunities, compliance with treaty obligations, international human rights law and international criminal law. He frequently represents multinational companies on aspects of compliance with human rights.

Viren is an Adjunct Professor at Columbia Law School, where he currently teaches an upper-level seminar on International Commercial Arbitration. Prior to joining King & Spalding, Viren served as a law clerk to H.E. President Rosalyn Higgins at the International Court of Justice, and as a Legal Officer at the Special Court for Sierra Leone, a hybrid war crimes tribunal based in Freetown, Sierra Leone.

He previously was a member of the arbitration group at Freshfields Bruckhaus Deringer LLP and the litigation group at Skadden, Arps, Slate, Meagher & Flom LLP. He is very active in the international law community. He is on the Steering Committee of the CPR Institute for Dispute Resolution Y-ADR Group,  the Global Executive Board of the International Center for Dispute Resolution’s Young & International Group, and has held various leadership roles in the American Bar Association Section of International Law.

Viren received his J.D. from Columbia Law School, where he was a Kent Scholar, and his LL.M. from the University of London with Distinction.


  • New York


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