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Mark Leddy
Lawyers profile
Global 2025
Lawyers profile | Global 2025: Antitrust: Cartel, Competition/Antitrust
Mark Leddy
Ranked in 3 Practice Areas
S

Senior Statespeople

Antitrust: Cartel

USA

8 Years Ranked

F

Foreign Expert

Competition/Antitrust

USA

13 Years Ranked

F

Foreign Expert

Competition/Antitrust

USA

13 Years Ranked

Ranked in Guides
USA 2024

About

Provided by Mark Leddy

Global

Practice Areas

US and European antitrust law, including civil and criminal litigation, analysis of competitive issues in mergers and acquisitions, and appearances before antitrust regulatory agencies and the U.S. federal courts.

Career

Joined firm as partner, 1986. Resident in firm’s Brussels office (1991-94). US Department of Justice (1972-86); Deputy Assistant Attorney General (1984-86). JD, Boston College Law School (1971); BA, Boston College (1968).

Professional Memberships

Massachusetts and DC Bars; U.S. Supreme Court and various circuit courts of appeal.

Chambers Review

Provided by Chambers

Chambers Global Guide

Antitrust: Cartel - USA

S
Senior Statespeople
Individual Editorial
Mark Leddy is commended for his representation of a broad array of prominent clients in competition disputes. His previous DOJ experience bolsters his ability to handle cartel investigations.
Learn more about this team❖View ranking table

Competition/Antitrust - USA

F
Foreign expert in Belgium
Individual Editorial
Mark Leddy is commended for his representation of a broad array of prominent clients in competition disputes. His previous DOJ experience bolsters his ability to handle cartel investigations.
Mark Leddy is commended for his representation of a broad array of prominent clients in competition disputes. His previous DOJ experience bolsters his ability to handle cartel investigations.
View foreign expertise table

Strengths

Provided by Chambers

"Mark Leddy is a fantastic lawyer."

Antitrust: Cartel respondent
Chambers Global Guide

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