Guillermo Osorio

He is part of the litigation team specializing in complex employment lawsuits that manages a portfolio of high-profile lawsuits, primarily disputes with executives, directors, and expatriates. Over the past decade, the team has defended multinational companies in a portfolio valued at over USD 600 million, including Argentina's most economically relevant individual labor law trial. He also provides advice from the labor perspective on mergers, due diligences, complex compensation structures, hires, and sensitive and massive terminations. At the same time, he is a member of the Firm's Strategic Innovation Committee, which has developed various technological solutions for the management of claims and lawsuits. · Marval O’Farrell Mairal

ArgentinaLabor & Employment, LitigationSpanish, English, Portuguese

About

Guillermo Osorio is a partner in the Labor Department at Marval O’Farrell Mairal who specializes in complex employment litigation, managing a portfolio of high‑profile disputes—primarily involving executives, directors and expatriates. Over the past decade his team has defended multinationals in matters collectively valued at over USD 600 million, including Argentina's most economically relevant individual labor law trial; he advises on labor aspects of mergers and due diligence, complex compensation and hires, sensitive and massive terminations, serves on the firm's Strategic Innovation Committee developing technological solutions for claims and lawsuits, joined Marval in 2009 and has been a partner since 2019.

Practice areas

Labor & EmploymentLitigation

Office

Argentina

Marval O’Farrell Mairal · He is part of the litigation team specializing in complex employment lawsuits that manages a portfolio of high-profile lawsuits, primarily disputes with executives, directors, and expatriates. Over the past decade, the team has defended multinational companies in a portfolio valued at over USD 600 million, including Argentina's most economically relevant individual labor law trial. He also provides advice from the labor perspective on mergers, due diligences, complex compensation structures, hires, and sensitive and massive terminations. At the same time, he is a member of the Firm's Strategic Innovation Committee, which has developed various technological solutions for the management of claims and lawsuits.

Argentina

Expertise

Complex Employment LitigationExecutive/Director & Expatriate DisputesLabor Advice on Mergers & Due DiligenceComplex Compensation Structures & Executive HiresMass Terminations/RestructuringsLitigation Technology & Claims Management

Education

Law degree, Universidad de Buenos Aires (2007)
Postgraduate specialization in Labor Law, Pontifical Catholic University of Argentina
Postgraduate coursework in Complex Litigation and Labor Complex Litigation before the Supreme Court of Justice, Torcuato Di Tella University
Continuing education courses, Asociacion Argentina de Derecho del Trabajo y la Seguridad Social
CS50 for Lawyers course, Harvard University (September 2020)

Admissions

City of Buenos Aires Bar Association
San Isidro Bar Association

Languages

SpanishEnglishPortuguese