Dr. Thomas D. Grant has advised and represented clients for over twenty years in complex multijurisdiction disputes, including in litigation and arbitration before the main treaty-based international courts and tribunals. Dr. Grant served as Senior Advisor for Strategic Planning in the U.S. Department of State’s Bureau of International Security and Nonproliferation from September 2019 to January 2021, where he helped implement counter-China initiatives, export control and investment review realignment, sanctions policy, and the Department’s new Bureau of Cybersecurity and Emerging Technology. He is a former U.S. designee to the Permanent Court of Arbitration roster and has served in various roles in cases before ICSID, UNCITRAL, SCC, ICC, PCA, and UNCLOS Annex VII arbitral tribunals. At Kieff Strategies LLC, Dr. Grant helps private firms in technology, energy, finance, and law navigate market, legal, and regulatory landscapes at home and abroad and collaborates with clients internally to develop and implement effective strategies to optimize corporate management, governance, and compliance. He has served as expert witness in complex post-award enforcement proceedings and as advisor on a range of sensitive treaty and contractual negotiations for both governmental and private sector clients.

Dr. Grant is a frequent public speaker and is among the most widely-cited writers of his generation in international law. His published writings have appeared in the most prestigious scholarly journals in the field and have been cited or referred to by courts and tribunals in several countries and international jurisdictions. He is a Fellow of the Lauterpacht Centre for International Law and Wolfson College at the University of Cambridge and has held visiting posts at the Max Planck Institute for Public International Law in Heidelberg, the U.S. Institute of Peace in Washington, DC, and the Hoover Institution at Stanford. He graduated with an AB, summa cum laude and Phi Beta Kappa Junior Twelve, in 1991 from Harvard; a JD in 1994 from the Yale Law School; and a PhD in 2000 from Cambridge, where he studied on a Fulbright scholarship. From 2000 to 2002, he was a research fellow at St. Anne’s College, Oxford, before returning to Cambridge as a Fellow. He clerked on the U.S. Court of Appeals (1st Circuit), 1994-1995.

Dr. Grant was born in Gettysburg, Pennsylvania and raised in North Attleboro, Massachusetts, where he attended public schools.


  • On the Path to AI: Law’s Prophecies and the Conceptual Foundations of the Machine Learning Age, Palgrave Macmillan, 2020, co-authored
  • Arbitration: A Very Short Introduction, Oxford U. Press, forthcoming, co-authored
  • Banks and Financial Crime: The International Law of Tainted Money, 2nd edition, Oxford U. Press, 2017, co-authored
  • Aggression Against Ukraine: Territory, Responsibility, and International Law, Palgrave Macmillan, 2015
  • Oppenheim’s International Law, Oxford U. Press, 10th edition, contributing author
  • International Law and the Post-Soviet Space (two volumes), Ibidem/Columbia U. Press, 2019
  • Lobbying, Government Relations, and Campaign Finance Worldwide: Navigating the Laws, Regulations and Practices of National Regimes, Oceana/Oxford U. Press, 2005
  • Max Planck Encyclopedia of Public International Law, Oxford U. Press, contributing author
  • The United Nations Convention on Jurisdictional Immunities of States and Their Property: A Commentary, Oxford U. Press, 2013, contributing author