Ari D MacKinnon

Practice Areas

Ari D. MacKinnon’s practice focuses on international arbitration in Latin America, with a particular emphasis on matters relating to the oil & gas, mining and infrastructure sectors, as well as ESG- and corruption-related issues.

Ari has successfully represented a number of major Latin American oil and gas, energy, infrastructure, and pulp and paper companies, as well as other clients in disputes in the region. He speaks regularly in Latin America on topics related to arbitration and crisis management. Ari has experience conducting arbitrations in both English and Spanish.

Career

Ari joined the firm in 2009 and became a partner in 2015. J.D., New York University School of Law (2006); M.A., Middlebury College (2006); B.A., Grinnell College (2002).

Professional Memberships

Member, New York Bar.

Member, Program Committee, New York International Arbitration Center.

Member, Chartered Institute of Arbitrators

Included on Arbitrator Roster, Arbitration Centre of the Lima Chamber of Commerce

Member, New York City Bar Association Council on International Affairs

Member, International Arbitration Club of New York

Member, Association of International Petroleum Negotiators

Publications

Second Circuit Holds Section 1782 Discovery Is Not Available In An ICSID Arbitration

Cleary Gottlieb Steen & Hamilton LLP, July 24, 2024

An alert memo by Ari Mackinnon, Jeff Rosenthal, Carmine Bocuzzi, and Boaz Morag

U.S. Supreme Court Rules That Judges, Not Arbitrators, Decide If A Dispute Is Arbitrable When Multiple Agreements Conflict On The Question

Cleary Gottlieb Steen & Hamilton LLP, May 28, 2024

An alert memo by Jeff Rosenthal, Ari MacKinnon, Chris Moore, and Mark McDonald

International Bar Association Publishes Revisions to Guidelines on Conflicts of Interest in International Arbitration

Cleary Gottlieb Steen & Hamilton LLP, March 8, 2024

An alert memo by Ari MacKinnon, Jeff Rosenthal, Boaz Morag, Katie Gonzalez and Elisa Zavala

Five International Arbitration Trends and Topics for 2024

Cleary Gottlieb Alert Memorandum, January 4, 2024

An alert memo by Ari MacKinnon, Chris Moore, Jeff Rosenthal, Katie Gonzalez, and Naomi Tarawali

Arbitraje y la Constitución Argentina

Arbitragem e Constituiçao, Thomson Reuters’ Revista Dos Tribunais, November 2, 2023

Investment Treaty Arbitration: Ecuador

Global Arbitration Review, October 2, 2023

Cleary Gottlieb partner Ari MacKinnon and associates Katie Gonzalez and Elisa Zavala co-authored the “Ecuador” chapter in GAR Know-how: Investment Treaty Arbitration, published by Global Arbitration Review.

The Lithium Triangle: Challenges and Opportunities for Latin America

Cleary Gottlieb Steen & Hamilton LLP, September 25, 2023

An alert memo by Ari MacKinnon, Jeffrey A. Rosenthal, Adam Brenneman, Aaron J. Meyers, and Boaz S. Morag titled, “The Lithium Triangle: Challenges and Opportunities for Latin America”.

U.S. Supreme Court Authorizes Foreign Plaintiffs To Use Domestic RICO Statute In Aid Of Enforcement Of Arbitral Awards In The United States

Cleary Gottlieb Steen & Hamilton LLP, July 3rd 2023

An alert memo by Ari MacKinnon, Christopher Moore, Paul Leist, Katie Gonzalez, and Stanislaw Krawiecki titled, “U.S. Supreme Court Authorizes Foreign Plaintiffs To Use Domestic RICO Statute In Aid Of Enforcement Of Arbitral Awards In The United States”.

U.S. Supreme Court Rules That an Appeal of an Order Denying a Motion to Compel Arbitration Automatically Stays District Court Proceedings

Cleary Gottlieb Steen & Hamilton LLP, June 29th, 2023

An alert memo by Ari MacKinnon, Jeffrey Rosenthal, Carmine Boccuzzi, Nowell Bamberger, Boaz Morag, Samuel Levander, Katie Gonzalez, Chihiro Isozaki, and Rathna Ramamurthi titled, “U.S. Supreme Court Rules That An Appeal Of An Order Denying A Motion To Compel Arbitration Automatically Stays District Court Proceedings”.

Investment Treaty Arbitration

Corporate Disputes Magazine, June 8th, 2023

Ari MacKinnon co-authored the chapter, “Investment Treaty Arbitration”, which was published in the Jul-Sep 2023 issue of Corporate Disputes Magazine.