Jeffrey Blumenfeld Partner and Co-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.
View More...

Other Distinctions

  • The Best Lawyers in America (2009 - 2018) – Recognized for antitrust.

  • Washington DC Super Lawyers (2017) – Recognized for antitrust.

  • Antitrust Division of the Department of Justice – Special Commendation for Outstanding Service in the Antitrust Division.

Speaking Engagements

  • “Recent Developments in Telephone Consumer Protection Act (TCPA) Enforcement and Litigation,” ABA Section of Antitrust Law, Civil Practice and Procedures Committee (December 5, 2016). Presenters: Jeffrey Blumenfeld (co-organizer), Jeffrey Jacobovitz (Arnall Golden Gregory LLP)(co-organizer), Janice L. Kopec (FTC Bureau of Consumer Protection), Kristi Thompson (Deputy Division Chief, Telecommunications Consumers Division, Enforcement Bureau, FCC), Leslie Bender (GC/VP Government Affairs, BCA Financial Services, Inc.), David Kaminski (Partner, Carlson & Messer)

  • "Antitrust, Patent Law, SEPs, FRAND: Who’s in Charge Here?” SAS Conference on Patent Litigation (April 2017)

  • “IP, Antitrust, and FRAND in China Today,” Client Presentation (February 2017)

  • “EU Developments on Standard Essential Patents: Huawei v ZTE and After,” Client Presentation (October 2016)

  • “Antitrust Essentials for Credit Professionals,” NACM Colorado Conference (May 2016), presenters: Jeffrey Blumenfeld, Bruce Nathan

  • “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
View More...

Press Mentions

Jeff Blumenfeld comments in Washington Lawyer on how Lowenstein Sandler capitalizes on international legal networks and a collaborative culture to meet our clients’ legal needs in today’s globalized economy. , Washington Lawyer , August 2017
In Law360, Jeffrey Blumenfeld discusses what to expect in the new administration’s approach to antitrust and merger enforcement under AAG nominee Makan Delrahim. , Law360 , April 25, 2017
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
View More...

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