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Henry Weisburg

Of Counsel

Henry’s international arbitration and international litigation practice focuses on the resolution of cross-border financial disputes arising out of investment, project and joint venture disputes, expropriations, banking insolvencies, sovereign debt restructurings and similar matters.

Henry represents clients in international arbitrations in proceedings administered by many different bodies, including the International Court of Arbitration of the International Chamber of Commerce, the International Centre for Settlement of Investment Disputes, the American Arbitration Association and the London Court of International Arbitration, as well as in ad hoc proceedings. In addition, he regularly appears in domestic courts with respect to issues such as the construction and enforcement of arbitration clauses, arbitral awards and foreign judgments, sovereign immunity issues and matters involving torts under international law. He also acts as arbitrator.

Henry was selected as 2012 Global Lawyer of the Year by The American Lawyer (27 December 2012). He has been praised by clients and peers in leading directories as “tremendously smart,” a “hugely experienced and very impressive” lawyer with an “electric intellect” and who “always has his strategy clearly defined” and is “excellent at preparing a case.”


Representative matters

International Arbitration

A European biotech company, Claimant in an arbitration in New York under the CPR non-administered rules against a North American company in the healthcare sector. The dispute arises from a collaboration agreement. New York law applies.

The Republic of Panama, Respondent in an ICSID arbitration brought by Omega Engineering LLC and Mr. Oscar Rivera (ICSID Case No. ARB/16/42). The dispute relates to infrastructure construction projects. The claims are brought under both the US-Panama bilateral investment treaty and trade promotion agreement.

The Dow Chemical Company in winning the largest ICC arbitration award ever (USD 2.5 billion), against a Kuwaiti state-owned company arising out of a failed petrochemicals joint venture. Shearman & Sterling was awarded The American Lawyer’s Grand Prize for Global Dispute of the Year (2013) for its conduct of this case.

Leadership Positions And Professional Affiliations

Director, New York International Arbitration Center (NYIAC)


Member, Task Force on the Revision of the ICC Rules of Arbitration


Member, New York State Bar Association Task Force on New York Law in International Matters


Founding Member, The International Arbitration Club of New York


Member, London Court of International Arbitration (LCIA)


Member, International Arbitration Institute (IAI)


Member, American Society of International Law (ASIL)


Member, American Bar Association (ABA)


Director, American Arbitration Association (AAA) (1992-97)

Henry Weisburg has a 'wealth of experience and demonstrates extraordinary knowledge of the law,' reports one client, adding that he has 'at all times been extremely responsive with sensible, concise and coherent advice on the relevant issues.' He acts for clients on both commercial and investment treaty arbitrations, as well as offering wider skill as a litigator.
International Arbitration (U.S.), 2021
Henry Weisburg is well regarded for his wide-ranging practice, covering investment treaty and commercial arbitrations. He regularly acts for a variety of clients, including states and multinational companies.
Chambers Global 2020 – International Arbitration (U.S.), 2020


  • Litigator of the Week (Jan. 9, 2014), for Second Circuit affirmance of Ometto v. ASA Bioenergy Holding A.G., No. 12-4022(L) (2d Cir. Jan. 7, 2014), American Lawyer, 2014
  • Grand Prize for Global Dispute of the Year for the firm’s handling of The Dow Chemical Company v. Kuwait, American Lawyer, 2013
  • Global Lawyer of the Year, American Lawyer, 2012



New York State (First Dept)-NY-State, 1978


Court of Appeals-PA-Federal-3rd Circuit, 2007
Court of Appeals-MA-Federal-1st Circuit, 2000
Court of Appeals-IL-Federal-7th Circuit, 1999
New York Northern District Court-NY-Federal-2nd Circuit, 1998
Court of Appeals-AL-Federal-11th Circuit, 1997
New York Western District Court-NY-Federal-2nd Circuit, 1995
Court of Appeals-VA-Federal-4th Circuit, 1994
Court of Appeals-CA-Federal-9th Circuit, 1987
Court of Appeals-LA-Federal-5th Circuit, 1981
US Supreme Court-DC-Federal, 1981
Court of Appeals-NY-Federal-2nd Circuit, 1981
New York Eastern District Court-NY-Federal-2nd Circuit, 1978
New York Southern District Court-NY-Federal-2nd Circuit, 1978


J.D., New York University, 1977
Bachelor of Arts, Trinity College (CT), 1973
A&O Shearman was formed on May 1, 2024 by the combination of Shearman & Sterling LLP and Allen & Overy LLP and their respective affiliates (the legacy firms). Any matters referred to above may include matters undertaken by one or more of the legacy firms rather than A&O Shearman.