Jeffrey Blumenfeld Partner and Chair, Antitrust & Trade Regulation

Washington, DC
T 202.753.3810; M 202.255.6300

Jeff is a leading figure in the competition issues that shape today’s economy, particularly those affecting technology-based companies. Clients value his understanding of a wide variety of industries, as well as his collaborative approach to accomplishing business goals. With nearly 30 years of private practice experience, Jeff has an in-depth knowledge of competition principles, technology, regulation, and economics.

As outside counsel, in-house general counsel, and board director, Jeff represents companies and their investors on competition issues, including those at the intersection of antitrust and intellectual property. Understanding that legal strategy must serve business strategy, Jeff functions as an integral part of his clients’ business teams, from major brands to early-stage venture-backed tech companies.

Jeff is an accomplished litigator and trial lawyer in a variety of complex matters, including civil and criminal antitrust matters (both plaintiff and defense), mergers and acquisitions, and criminal price-fixing investigations. He also has a long record of successfully trying complex regulatory matters involving engineering and technology issues; economic, costing, and pricing issues; and competitive conduct issues at federal and state regulatory commissions nationwide.

Beginning his career at the U.S. Attorney’s Office and the Antitrust Division of the Department of Justice (DOJ), Jeff has first-chaired more than 60 jury trials. He was one of the senior DOJ trial attorneys in the 18-month trial of United States v. AT&T (the divestiture case), and served as Chief of the Trial Staff during the first wave of post-divestiture litigation.

Representative Engagements

Serves as outside general counsel to HEVC Advance, an independent licensing administrator formed to support the rapid and widespread adoption of the new HEVC/H.265 video compression standard.
Represented Buddy Media in its sale to
Represented an air cargo carrier in international antitrust cartel investigations and related civil litigation.
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Other Distinctions

  • The Best Lawyers in America (2009 - 2017) – Recognized for antitrust.

Speaking Engagements

  • “Special Masters in Antitrust Litigation,” ABA Section of Antitrust Law Civil Practice & Procedures Committee (January 2014). Presenters: Jeffrey Blumenfeld, Jeffrey Jacobovitz (Arnall Golden Gregory LLP), Hon. Richard A. Levie (Ret.), Mark Ryan (U.S. Department of Justice Antitrust Division), Paula Render (Jones Day).

  • "ABA Program: Patent Pools," ABA Antitrust Section Teleconference, sponsored by the Antitrust and IP Committee (June 2013). Presenters: Jeffrey Blumenfeld, Patrick Kuhlman (Dept. of Justice), Robert Levinson (Charles River Associates), Amanda Reeves (Latham & Watkins).

  • "ABA Program: Private Damages Actions in the U.S. and the EU: Post-ECJ Ruling on Third-Party Access to Confidential Leniency Documents," ABA Antitrust Section Teleconference, sponsored by the Criminal Antitrust Committee (May 2012). Presenters: Jeffrey Blumenfeld, William Lawler, Bernd Meyring, Marta Giner.

  • "Antitrust: Is Anyone on DOJ’s Radar? – Update on Trends in Competition Enforcement in the US and the EU,” Law Seminars International (December 2011), Panelists: Jeffrey Blumenfeld and Chris Meyers (Associate General Counsel for Competition, Microsoft).

  • "Antitrust Update," ABA Antitrust Section Teleconference, sponsored by the Corporate Counseling Committee (May 2009). Co-Presenters: Jeffrey Blumenfeld, Christine L. White, Shawn R. Johnson, Daniel L. Zelenko and Sean-Paul Brankin.


2017 HSR Thresholds Announced by Federal Trade Commission
Antitrust & Trade Regulation Client Alert, January 26, 2017
Jack Sidorov, Jeffrey Blumenfeld, Jeffrey Shapiro
2016 HSR Thresholds Announced by Federal Trade Commission
Antitrust and M&A Client Alert, February 4, 2016
Jack Sidorov, Jeffrey Blumenfeld, Jeffrey Shapiro
Annual HSR Threshold Adjustments Announced By Federal Trade Commission
Antitrust and Mergers & Acquisitions Client Alert, January 22, 2015
Jack Sidorov, Jeffrey Blumenfeld, Jeffrey Shapiro
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Press Mentions

Jeff Blumenfeld is quoted in Variety on how the AT&T-Time Warner merger will affect content competitors such as Netflix and Hulu. , Variety , November 1, 2016
Jeff Blumenfeld comments in a Bloomberg BNA article about possible ramifications of the 2011 joint agreement between Comcast and NBCUniversal on the AT&T-Time Warner bid. , BloombergBNA , October 25, 2016
In Law360Jeff Blumenfeld discusses AT&T’s $84.5B Time Warner takeover and the likely shift in incentives and conduct once the two companies merge. , Law360 , October 24, 2016
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Related Areas

Antitrust & Trade Regulation
The Tech Group
White Collar Criminal Defense


University of Pennsylvania ( J.D. )
Brown University ( A.B. ) , cum laude

Bar Admissions

District of Columbia

Court Admissions

U.S. Supreme Court
U.S. Court of Appeals, District of Columbia Circuit
U.S. District Court, District of Columbia
District of Columbia Court of Appeals
U.S. Court of Appeals, Ninth Circuit