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Gregory Werden

Gregory Werden

Senior Economic Counsel, Antitrust Division (Retired)

U.S. Department of Justice

Gregory J. Werden retired in 2019 after 42 years at the Antitrust Division of the U.S. Department of Justice. At the Justice Department, he was involved in preparing numerous sets of enforcement guidelines and drafting over a hundred briefs filed in the appellate courts or the Supreme Court. He is the only Antitrust Division employee ever to be awarded the Department’s Mary C. Lawton Lifetime Service Award. He continues to contribute to antitrust scholarship and recently published a book titled The Foundations of Antitrust: Events, Ideas, and Doctrines (Carolina Academic Press).

Recent Publications

March 17, 2026

Creative Discussion Podcast: Greg Werden on the DOJ, Merger Guidelines and the Evolving Role of Economists

Joseph V. Coniglio hosts the third episode of a new antitrust speaker series and interviews longtime antitrust scholar and retired DOJ economist Greg Werden.​ They discuss Werden’s path from chemistry to economics and his four-decade career at DOJ, discussing both constants and changes in antitrust enforcement.

More publications by Gregory Werden

Recent Events and Presentations

January 28, 2026

A Strange Vibration? The Uncertain Future of California Antitrust Law

Watch now for a virtual panel featuring leading experts who will discuss the future of California's antitrust laws, their implications for national innovation and competition, and how these developments fit into the broader antitrust policy debate.

March 16, 2022

Dynamic Antitrust Discussion Series: “Has Economic Concentration Really Increased?”

Join ITIF for a discussion on the accuracy of the narrative put forward and whether or not market concentration has, indeed, increased with ITIF's Julie Carlson & Robert D. Atkinson, Nicholas Trachter of the Federal Reserve of Richmond, & former DOJ official, Gregory Werden.

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