Katelyn A. Horne

Katelyn A. Horne

Senior Associate

Katelyn Horne concentrates her practice on international arbitration and public international law. She represents sovereign States in investment treaty arbitrations and other international disputes. She advises clients on a broad range of topics, including investment law, treaty interpretation, the law of the sea, sovereign immunity, and international human rights law. She also has experience in domestic litigation and international commercial arbitration.

Prior to joining the firm, Ms. Horne served as an Associate Legal Officer to His Excellency Judge Hisashi Owada of the International Court of Justice in The Hague. She received the David M. Berger Memorial Prize in International Law and was a member of Columbia Law School's two-time national championship Jessup International Law Moot Court team. Ms. Horne previously served in the Executive Branch of the US Government.


  • Representing the Republic of Panama in an investment dispute in the hydroelectric power sector.
  • Representing the Republic of Panama in an investment dispute concerning intellectual property rights.
  • Representing the Republic of Chile in the long-standing Pey Casado arbitration.
  • Representing a South American railway concession in a dispute with some of its shareholders.


International Arbitration (USA) 2019
Chambers Global Practice Guide


  • JD, Columbia Law School, 2015, James Kent Scholar
  • BSFS, International Politics, Georgetown University School of Foreign Service, 2011, magna cum laude
  • District of Columbia
  • North Carolina
Government & Military Service
  • Confidential Assistant, US Department of Homeland Security (2012)
  • Associate, Executive Office of the President, The White House (2010-2011)
  • International Court of Justice, His Excellency Judge Hisashi Owada
  • Member, American Society of International Law

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