Chaffetz Lindsey’s Aníbal Sabater Contributes to Harvard Arbitration Review

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Chaffetz Lindsey’s Aníbal Sabater Contributes to Harvard Arbitration Review

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June 2026 – Chaffetz Lindsey’s Aníbal Sabater contributed to the third edition of the HIALSA Arbitration Review (HAR), published by the Harvard International Arbitration Law Students Association (HIALSA). HAR is the first arbitration-focused publication edited by students at Harvard Law School.

In his article “Incredible Witnesses: A Look At The Main Reasons Why Tribunals Do Not Believe Some Testimony”, Aníbal explores the key patterns that arbitral tribunals rely on when assessing witness credibility, including conflicts of interest, shifting testimony, selective memory, and lack of documentary support. Aníbal underscores the importance of careful witness vetting, cautioning that a single unreliable witness can cast doubt on an entire case.

This year’s edition brings together leading voices in international arbitration and dispute resolution, with contributions from distinguished academics and practitioners from around the world, including Diego P. Fernández Arroyo, Bruno Simma, Jose Roberto de Castro Neves, Gitanjali Baja, Daniela Bambaci, Emilio Garcia Silver, Joanne Lau, Rahim Moloo, Giuditta Cordero-Moss, Michele Miozzo, Claudia Frutos-Peterson, Njeri Kariuki, S.C., C.Arb, FCIArb., FCPSK and Philippe Sands.

To learn more and read the review, click here.

Aníbal Sabater Appointed to the Inaugural AIAC Court of Arbitration

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March 2026– Chaffetz Linsey’s Aníbal Sabater has been appointed as an inaugural member of the Asian International Arbitration Centre (AIAC) Court of Arbitration — a cornerstone in the newly reformed ADR framework that reinforces the AIAC’s mission to uphold excellence in international arbitration.

The AIAC Court, which was established under recent Malaysian ADR reforms to succeed the Kuala Lumpur International Arbitration Center, comprises a distinguished group of global arbitration practitioners committed to administering disputes with the highest standards of neutrality, independence, and efficiency. In this new role, Aníbal will contribute his expertise and independent judgment to support the effective administration of cases at the Asian International Arbitration Centre. He will work alongside fellow members to help ensure proceedings are conducted with fairness, neutrality, and efficiency, in line with the highest international standards.

This appointment underscores his deep expertise in international commercial and investment arbitration, built over nearly three decades advising and adjudicating complex cross-border disputes under the world’s leading institutional rules.

Learn more about the organization here.

Chaffetz Lindsey International Arbitration Team Recognized in 2026 Chambers Global Guide

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February 2026 — Chaffetz Lindsey’s international arbitration practice continues to be recognized among the world’s leading teams in the 2026 Chambers Global Guide, with the firm again appearing in the Global Market Leaders rankings for International Arbitration.

In addition to Chaffetz Lindsey’s recent high-placed rankings in Chambers USA, Chambers Latin America and Chambers Brazil, the firm remains one of only a handful of boutiques featured in the Global Market Leaders tables, underscoring its reputation for handling high-stakes disputes around the globe. Clients noted the firm’s “highly sophisticated team” and “deep experience” which “guarantees a very strong ability to handle complex and sophisticated matters.”

Chaffetz Lindsey partners James Hosking, Aníbal Sabater, and Yasmine Lahlou have also been individually ranked in the 2026 Guide, highlighting their depth of experience and the strong endorsement of clients and peers around the world.

In addition, Anibal was ranked globally on the Most In Demand Arbitrators table.

Comments on our globally ranked arbitration partners include:

  • “Aníbal Sabater is widely recognised by the market for his impressive track record leading investment treaty arbitration cases across Latin America. His practice displays solid expertise, assisting clients with commercial controversies and also acting as arbitrator in complex disputes in the region.”
  • “James Hosking is the lawyer you always need. He is sophisticated, extremely well connected and bright.”
  • “Yasmine Lahlou is smart, bright and flexible. She is an amazing lawyer that is very effective, responsive and fair.”

Click here to view Chaffetz Lindsey’s Chambers Global profile.

Eight Chaffetz Lindsey Team Members Ranked Globally by Lexology Arbitration Report

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December 2025— The 2026 Lexology Arbitration Report  has once again included Chaffetz Lindsey’s international arbitration team among the top names in arbitration, listing eight team members alongside leading practitioners worldwide.

Among those listed, James Hosking and Yasmine Lahlou have been named as “Global Elite Thought Leaders.” According to Lexology, this title is reserved for practitioners considered the “best of the best across research, achieved by only around 5% listed practitioners.” Chaffetz Lindsey is one of only 10 firms in the world with more than one Global Elite Thought Leader in Arbitration.

Matilde Flores has been ranked for the first time as a “Future Leader in Arbitration,” likely to be one of the pre-eminent names of the next generation.

Additional accolades include Aníbal Sabater, Caline Mouawad, Peter Chaffetz, David Lindsey, and Gretta Walters all of whom are listed as Recommended Leaders in Arbitration — individuals regarded as standard-setters in the profession.

The team continues to stand out as leading names in the field, reaffirming their reputations as trusted counsel and arbitrators in some of the most complex cross-border disputes.

The Lexology Arbitration report (formally Who’s Who Legal) is the result of extensive market research and peer review, recognizing only a select group of practitioners who are consistently identified by clients, arbitrators, and peers as leaders in international arbitration. Learn more here.

Anibal Sabater to Speak on New York Arbitration Week Panel

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November 2025 – Chaffetz Lindsey’s Aníbal Sabater will participate on an upcoming New York Arbitration Week panel organized by WilmerHale, taking place Tuesday, November 18th.

Aníbal will join the panel “Is New York as a seat and governing law still a top choice for Latin American commercial arbitration?” which will explore the shifting landscape of arbitration choices for Latin American parties. The discussion will address:

  • New York’s historical role as a leading arbitral seat for disputes originating in Latin America
  • The growing competition from other US arbitration seats and seats in Latin America
  • The current choices Latin American parties are making regarding arbitration seat and governing law
  • How New York compares to its competitors in terms of these decisions

The session will be moderated by Claudio Salas (WilmerHale) and will feature fellow panelists Jessika Rocha (Von Wobeser y Sierra), Claudia Benevides (Benevides Mejía), and Rafael Gagliardi (Xavier Gagliardi Inglez Schaffer).

To learn more about New York Arbitration Week, click here.

Aníbal Sabater to Speak on Advanced Oral Advocacy Techniques at CeCAP Seminar in Panama

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October 2025 — Chaffetz Lindsey’s Aníbal Sabater will participate as a panelist at the upcoming Seminario de Actualización en Arbitraje Nacional e Internacional, organized by the Centro de Conciliación y Arbitraje de Panamá (CeCAP). The event will take place October 22nd-October 23rd in Panama.

Aníbal will join the panel “Técnicas Avanzadas de Litigación Oral en Arbitraje,” which will explore strategies for enhancing advocacy and case presentation in arbitration proceedings. The discussion will address:

  1. Crafting a memorable and strategic case structure aligned with case theory
  2. Effective direct examination techniques to establish credibility and coherence
  3. Managing expert witnesses, including cross-preparation, “hot tubbing,” and challenging assumptions
  4. Utilizing audiovisual tools and technology such as timelines, maps, and dynamic evidence

The session will be moderated by Diego Maximin (Pinto & Villarreal) and will feature fellow panelists Daniel Ávila (Reed Smith), Eric Britton (Britton & Iglesias), and Jorge Molina Mendoza (Fábrega Molino).

The CeCAP seminar will bring together leading arbitration practitioners and academics from across Latin America to discuss evolving practices in national and international arbitration. This year’s edition will emphasize interactive and practical exchanges between panelists, encouraging dynamic dialogue and collaboration.

 

Aníbal Sabater to Speak on AAA “Energy Arbitration 360” Panel

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October 2025 — Chaffetz Lindsey’s Aníbal Sabater will speak on the panel “Energy Arbitration 360: Perspectives from Arbitrators, In-House Counsel, and Advocates”, taking place virtually on October 7th, 2025.

This panel offers a 360-degree look at arbitration in the energy sector, bringing together arbitrators, in-house counsel, and advocates to share perspectives on negotiating, managing, and resolving disputes in energy projects.

The discussion will cover the full lifecycle of energy arbitration — from drafting clauses to enforcement — and spotlight trends, strategies, and lessons learned from recent cross-border disputes.

Panel Details:

Moderator:

  • Chimdimma Onyedebelu (AAA Director of ADR Services)

Additional Panelists:

  • Edward “Ed” Diggs (Bechtel Corporation)
  • Sashe Dimitroff (BakerHostetler)

Learn more and register for the event here.

Aníbal Sabater to Speak on “The Arbitrator as Case Manager” at ICC Latin American Group Meeting in Buenos Aires

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September 2025 — Chaffetz Lindsey’s Aníbal Sabater will speak alongside Dyalá Jiménez (DJ Arbitraje) to examine the benefits, limits, and risks of proactive arbitral intervention, exploring how arbitrators can balance efficient case management with the need to preserve party autonomy and due process. The event will take place in Buenos Aires on Monday, September 22, 2025.

Organized by the Institute for Transnational Arbitration (ITA) Americas Initiative in collaboration with the Asociación Latinoamericana de Arbitraje (ALARB) and held in the context of the ICC Latin American Group meeting, the session is titled: “The Arbitrator as Case Manager: How Far and How?”

For more details and to register, visit the event page.

Chambers Latin America 2026 Rankings Highlight Chaffetz Lindsey International Arbitration Team’s Geographic Reach

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August 2025 — The 2026 Chambers & Partners Latin America Guide once again underscores Chaffetz Lindsey’s position as a top international dispute resolution boutique, with the firm’s market-leading international arbitration team showcasing its geographic reach with its ranking in International Arbitration: International Counsel. The team continues to be recognized alongside its full-service multi-office competitors.

Clients praise the entire firm for its professionalism and client service. One source says “The Chaffetz Lindsey team have a lot of common sense and finesse in their arguments, which are straightforward, clear and very well structured. They always meet the required quality and deadlines.”

Chambers has also recognized the contributions of several key members:

  • Aníbal Sabater (Band 2): Renowned for his leadership in complex investment treaty arbitrations across Latin America. A source remarked “Aníbal Martin Sabater is a well-regarded lawyer in the arbitration field in Latin America.”
  • James Hosking (Band 4): Noted for his work in commercial and infrastructure arbitration, particularly in Argentina and Mexico. A client observed they “have been most impressed with James Hosking’s professionalism, responsiveness and grasp of technical and commercial issues.”
  • Yasmine Lahlou (Band 5): Skilled in construction and joint operating agreement disputes, another source remarked, “Yasmine Lahlou is always available and has a wide command of the substance of the matter at hand.”

In addition, Aníbal Sabater has been ranked Band 1 in the guide for his arbitrator expertise.

Chaffetz Lindsey lawyers have been deeply involved in Latin America-related disputes for decades. The firm’s team member brings their deep bench of experience and nuanced understanding of infrastructure, construction, and investment disputes across several jurisdictions in Latin America, including Argentina, Colombia, Panama, Peru, and more. In addition, the arbitration team maintains its separate recognition in Chambers Global, Chambers USA and Chambers Brazil. To view the firm’s International Arbitration profile, please visit our website or the Chambers Latin America website.

Chaffetz Lindsey Secures Resounding Victory for AES in Investment Arbitration Against Argentina

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August 2025 – New York, NY – In a landmark decision in favor of The AES Corporation (AES), an international tribunal has awarded the company over US$730 million in an ICSID arbitration against the Republic of Argentina. In its May 30, 2025 award (recently made public), the Tribunal unanimously held the Republic of Argentina liable under the Argentine–U.S. Bilateral Investment Treaty for unlawful and arbitrary interference with AES’s investments in eight power generation facilities. For the Chaffetz Lindsey team, this a significant victory for a longstanding client.

The Tribunal found that Argentina’s measures—including dismantling the electricity sector’s remuneration system, withholding owed receivables, and coercing AES’s subsidiaries to reinvest those receivables in new infrastructure—arbitrarily altered the essential characteristics of the electricity generation framework. These actions constituted violations of Argentina’s treaty obligations. The Tribunal also rejected all of Argentina’s jurisdictional and admissibility objections. As of the date of AES’s petition to confirm the award, Argentina owed US$821,070,619.71, including damages (to date), interest, and arbitration costs, making it the largest award rendered in any of the more than 60 ICSID arbitrations brought against Argentina following the 2001–2002 economic crisis.

“This case is deeply meaningful to our firm,” said James Hosking, Chaffetz Lindsey founding partner and head of the international arbitration practice. “AES entrusted us with this dispute from the moment we launched the firm in 2009. After helping the client navigate a decade-long suspension in which Argentina had promised to implement sector reforms, we were proud to resume the arbitration in 2018 and to deliver this result alongside our good friends at Freshfields and Bruchou.”

The Spanish-English bilingual merits hearing took place in 2023. The Chaffetz Lindsey team was led by partners James Hosking, Aníbal Sabater, and Caline Mouawad, with support from Matilde Flores, May Khoury, Silvia Marroquín, and Agustina Alfaro. Partner Andreas Frischknecht is now leading, as co-counsel with Freshfields, an action to enforce the award in the U.S. District Court for the District of Columbia.

Success in the AES case comes on the heels of a series of other recent investment arbitration wins for the firm, including in the case of APM Terminals Callao S.A. v. Republic of Peru and Clorox Spain S.L v. Bolivarian Republic of Venezuela.

The final award is available in full on the ICSID website.

The tribunal’s decision has garnered considerable global coverage. To access these articles, please click on the links provided below:

Aníbal Sabater, Gretta Walters, James Hosking Participate in ABA International Arbitration Skills Masterclass

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June 2025—Chaffetz Lindsey’s Aníbal Sabater, Gretta Walters, and James Hosking participated in the ABA International Law Section’s 2025 International Arbitration Skills Masterclass, held virtually from Tuesday, June 17th– Wednesday, June 18th.

The program offered junior and mid-level arbitration practitioners a unique opportunity to develop and refine their advocacy skills through a combination of faculty-led plenary discussions and hands-on practice sessions.

Aníbal served as a panelist during the session titled “Cross-Examining and Redirecting Fact Witnesses”. He was joined by internationally recognized colleagues including Henri Alvarez (Alvarez Arbitration), Jan Paulsson (Independent Arbitrator), and Eduardo Zuleta (Arbitration Chambers), with Diana Paraguacuto-Mahéo (Foley Hoag) moderating.

Gretta Walters joined the session “Cross-examining and Redirecting Expert Witnesses” with Preeti Bhagnani (White & Case) and Ari MacKinnon (Cleary Gottlieb). Cesar Pereira (Justen Pereira Oliveira & Talamini) moderated the discussion.

James and Gretta acted as faculty giving feedback to workshop participants during witness examination sessions.

The Masterclass is designed to give participants practical skills critical to the arbitral process, and the fact witness cross-examination panel will feature insights from leading practitioners on how to effectively challenge or rehabilitate testimony in high-stakes international disputes.

For more information, visit the ABA International Law Section’s website here.

Chaffetz Lindsey Dominates International Arbitration and Enforcement Rankings in Chambers USA 2025

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June 2025—The recently released 2025 Chambers USA Guide marks another milestone in the Chaffetz Lindsey’s team’s recognition as the leading US-based international arbitration and enforcement boutique. The team boasts seven ranked lawyers across three categories—the equal highest number of active lawyers of any firm in the US.  Recognized lawyers cover elite Band 1 leaders to Band 6 rising stars, demonstrating the strength and depth of the firm’s bench.

The firm’s international arbitration team continues to be ranked in “International Arbitration: The Elite” as the only New York-based boutique, placing it among top-tier global firms.

Chaffetz Lindsey’s six ranked lawyers appearing in the “International Arbitration: Counsel” table evidences the breadth and diversity of the team. New this year, Counsel May Khoury, is ranked as an “Associate to Watch,” recognizing emerging talent. Anibal Sabater, Caline Mouawad, James Hosking, Yasmine Lahlou, and Gretta Walters continue to be recognized in a group that one client described as “absolutely a force to be reckoned with.”

Andy Frischknecht and Yasmine Lahlou have again earned Band 1 recognition in the highly regarded International Arbitration: Enforcement rankings. Andy and Yasmine lead a majority of the firm’s major award and enforcement engagements. This marks the fourth year the firm has been recognized for its specialized practice in arbitration enforcement. With two Band 1 lawyers in this category, Chaffetz Lindsey is uniquely positioned to manage complex global enforcement mandates with boutique agility and elite capability.

A source close to the team noted, “They are always on point, prepared and ready.”

Anibal Sabater and James Hosking have also been named among the top Arbitrators in the country.

Sources had this to say about Chaffetz Lindsey partners:

  1. James Hosking “is as sharp as a surgeon’s knife.”
  2. Andreas Frischknecht’s “advice and awareness is enviable.”
  3. Yasmine Lahlou “is incredibly bright and super collegiate to work with.”
  4. Caline Mouawad [has a] “pragmatic, client-oriented mindset. She was able to figure out how to put the company’s priorities first.”
  5. Anibal Sabater “is extremely reliable, and it gives me comfort knowing that everything is under control. The experience he has is highly valuable.”
  6. Gretta Walters “is a lawyer’s lawyer. She is professional and outstandingly smart.”
  7. May Khoury’s work left one source “impressed.”

To view the firm’s International Arbitration and Enforcement profile, visit our website or the Chambers USA website.  For a full breakdown of Chaffetz Lindsey’s Chambers USA International Arbitration Rankings, see below.

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