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As international counsel to sovereign states, sub-sovereigns, state-owned entities, and multilateral organizations spanning five continents, Arnold & Porter understands the interplay of law, politics, public relations, and diplomacy when complex deals arise and high-profile or high-value disputes emerge. Our premier international practice has been combining deep professional experience with expansive perspectives to handle these types of transactions and disputes since the 1960s. Backed by the recognized excellence of our corporate and finance, regulatory, litigation, international arbitration, and international trade services — and enhanced by the awareness and finesse derived from the service of some of our partners in senior positions in U.S. and foreign governments and organizations — we provide the in-depth legal, policy, and negotiation skills that clients need in delicate situations.

  • Deep Bench of Former Senior U.S. and International Officials: Our unique team includes former U.S. Congress and executive branch members, as well as members of foreign governments and international organizations.

  • Leading International Disputes Practice: We are recognized as a leading firm for litigation under the Foreign Sovereign Immunities Act, international arbitration, and international trade matters — and for our consistent track record of victories in such disputes.

  • Cutting-Edge Transactions: Our preeminent Sovereign Finance practice provides thought leadership and advises sovereigns, sub-sovereigns, and state-owned companies on their most challenging financial transactions.

“Deep bench of former U.S. State Department lawyers and former U.S. government officials to provide expertise....” —Chambers Global (Public International Law, 2020)
“Credibility in the [global] market” ... [the team] brings a lot of gravitas to the table.” —Chambers Global (Sovereign Finance, 2020)
“Strong reputation [for representing] sovereign states in high-value international arbitration proceedings.” —Chambers Global (International Arbitration, 2021)
“Experienced in handling trade remedies matters, including anti-dumping and countervailing duties, as well as trade policy.” —Chambers Global (International Trade, 2021)

Key Contacts

Thomas A. Shannon, Jr.
Thomas A. Shannon, Jr.
Senior International Policy Advisor*
Washington, D.C.
+1 202.942.5417
Paolo Di Rosa
Paolo Di Rosa
Washington, D.C.
+1 202.942.5060
J. David Park
J. David Park
Washington, D.C.;
+1 202.942.5646 +82 2 6744 2000
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Related Services


  • The Legal 500 Latin America
    International Arbitration (2023)
  • The Legal 500 UK
    Dispute Resolution: International Arbitration (2023)
    Dispute Resolution: Public International Law (2023)
  • Chambers Latin America
    International Arbitration (Latin America-wide) (2023)
  • The Legal 500 US
    International Trade (2022)
    International Arbitration (2022)
  • Chambers Global
    International Arbitration (Global) (2022)
    International Arbitration (Latin America) (2022)
    International Arbitration: The Elite (USA) (2022)
    International Arbitration Foreign Expert for Latin America-wide—"Spotlight Table" (USA) (2022)
    Dispute Resolution: International Firms (South Korea) (2022)
    International Trade: Export Controls & Economic Sanctions (USA) (2022)
    International Trade: Trade Remedies & Trade Policy (USA) (2022)
    International Trade/WTO (Asia-Pacific) (2021)
  • Global Arbitration Review
    "GAR 100" (2020)
    Listed in Global Arbitration Review's "GAR 30" six times
  • Chambers Asia-Pacific
    International Trade: World Trade Organizations (Asia-Pacific Region) (2021)
    Dispute Resolution (International Firms) (2021)
  • U.S. News & World Report and Best Lawyers
    "Best Law Firms" –International Trade and Finance Law (DC, National) (2020)
    International Arbitration: Commercial (DC, National) (2020)
    International Arbitration: Governmental (DC, National) (2020)