Rainbow Willard


+1 212 257 6952
+1 212 257 6950
Where Advocacy Meets Business

“A pinch of plain language is worth a pound of hyperbole.”

Rainbow has significant experience helping clients streamline their strategy as they navigate parallel proceedings in international arbitration and national courts.  As an advocate, Rainbow’s focus is on making it easy for judges and arbitrators to decide in her clients’ favor—she breaks down jargon and legalese to simplify the decisions that need to be made in complex international disputes.  Rainbow has substantial oral advocacy experience in English and Spanish and is equally comfortable appearing in front of international arbitration tribunals and U.S. courts.


Prior to joining Chaffetz Lindsey in 2017, Rainbow was a senior associate in the international arbitration group of Allen & Overy LLP, practicing in their London and New York offices.  Rainbow clerked for the Honorable Kathleen M. Williams of the United States District Court for the Southern District of Florida, and also served as an assistant federal public defender in the Southern District of Florida, where she appeared as lead defense counsel in more than 100 federal felony cases.

Representative Matters

  • Representing a project owner in an ICC arbitration arising out of the construction of a solar plant in a dispute involving claims in excess of US$1 billion.
  • Representing a multinational energy company in an ICSID arbitration against a Latin America sovereign alleging breaches of a bilateral investment treaty and investment law.
  • Representing a financial institution in two multiparty ICC arbitrations over a put-option and several loan agreements – the dispute also involved 7 related court proceedings in the U.S. and Latin America.
  • Representing an investor in an investment treaty arbitration against a Latin American sovereign over certain tax measures (UNCITRAL arbitration).
  • Represented an oil and gas major and its Indian joint venture partner in arbitration proceedings against the Government of India, in disputes valued at over $5 billion (UNCITRAL arbitration).
  • Represented the Islamic Republic of Pakistan in two investment treaty arbitrations: one involving claims brought by a Turkish power ship company in excess of $2 billion, and the other arising out of the Reko Diq copper and gold mine in Balochistan, worth several hundred billion US dollars (ICSID arbitrations).
  • Represented a Middle Eastern LNG producer in three New York law governed commercial arbitrations resulting from contract sales price reviews (ICC and LCIA arbitrations).
  • Represented an investor in award enforcement proceedings against the Government of Belize in federal court in Washington, D.C., successfully obtaining enforcement of the award.


  • The Rise of Environmental Counterclaims in Mining Arbitration,” Global Arbitration Review’s Guide to Mining Arbitration (2019).
  • The Canadian Model BIT – A Step in the Right Direction for Canadian Investment in Africa?Kluwer Arbitration Blog, Co-Author (July 18, 2015).
  • Does A Private International Arbitration Fall Within “Foreign Or International Tribunal” in 28 U.S.C. § 1782?  Practice Pointers for Seeking Discovery in Aid of Arbitration after Intel Corp. v. Advanced Micro Devices, Inc.,” American Arbitration Association Yearbook on Arbitration and the Law 23 (Stephen K. Huber and Ben H. Sheppard, Jr., eds. 2011), Co-Author.
  • Note, “How to Get Less Than You Bargain For:  Adjudicating the Belize-Guatemala Territorial Dispute at the ICJ,” 23 Emory Int’l L. Rev. 739 (2009).

Professional Affiliations



  • J.D., Emory University School of Law with high honors (Order of the Coif; Robert W. Woodruff Fellow; Articles Editor Emory International Law Review; Exchange Program, Universidad Panamericana, Mexico City)
  • M.A., University of California, Berkeley
  • B.A., Tulane University, Newcomb College cum laude


  • New York


English, Spanish, Kaqchikel Maya

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