Jeffrey Blumenfeld

Lowenstein Sandler (Washington)
Lawyer (Partner)

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.

Linked authors

Lowenstein Sandler (Washington)
Lowenstein Sandler (Washington)


235 Bulletin

Zarema Jaramillo, Leiv Blad, Jeffrey Blumenfeld The US DoJ and FTC warn companies and would-be scammers that they will use their consumer protection and competition enforcement powers to go after anyone trying to take advantage of the COVID-19 outbreak


COVID-19: The Reaction of U.S. Antitrust Agencies* COVID-19 has impacted nearly every aspect of American life right now, and there are myriad legal issues companies are facing from the pandemic’s fallout. These include antitrust considerations, ranging from potentially criminal conduct to (...)

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