White & Case (Washington)

Heather Greenfield

White & Case (Washington)

Heather Greenfield is a partner in the Global Antitrust/Competition Practice of White & Case. Recognized in 2022 and 2021 by The Legal 500 US as one of only two "Rising Stars" nationwide in Merger Control, Heather has extensive experience representing clients in all phases of merger clearance before the Federal Trade Commission and Department of Justice, and before federal courts in litigated challenges by the government. As reported by The Legal 500 US, clients said Heather is "incredibly bright, and always finds solutions to unique problems" and further acclaimed she is "dedicated, sharp, calm." Clients also benefit from Heather’s significant experience on compliance related to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR Act) and global merger notification requirements, including in Europe, Asia, and South America. Heather has a proven track record advising clients on complex cross-border transactions that trigger filings around the world. Her expertise spans dozens of industries including technology, pharmaceuticals, health care, medical devices, semiconductors, solid waste, railroads, rental cars, construction, chemicals, and retail.

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2386 Bulletin

Mark J. Gidley, George Paul, Rebecca Farrington, Anna Kertesz, Tamer Nagy, Martin M. Toto, Douglas Jasinski, Heather Greenfield, Gabriela Baca, Allain Andry, Ashley Stoner, Cassandra Calderon, Andrew Hammond The US FTC and DOJ introduce new draft merger guidelines which foresee a clear shift in recent merger enforcement in the US


The Proposed Merger Guidelines represent the DOJ’s and the FTC’s aggressive scrutiny of mergers. As one of the most important reflections of policy the Antitrust Agencies use to analyze transactions, the Proposed Guidelines—once finalized—reflect the clear shift in recent merger enforcement in (...)

Rebecca Farrington (Hilberman), Heather Greenfield, Anna Kertesz, Mark J. Gidley, Gabriela Baca, Ashley Stoner, Allain Andry, Maia Gez, Michelle Rutta, Melinda Anderson The US DOJ continues its crackdown on illegal interlocking directorates thereby increasing the spotlight on private equity and technology firms and leading to the resignation of five more US company board directors


The Antitrust Division of the US Department of Justice ("DOJ") continues to aggressively pursue alleged illegal interlocking directorates that violate Section 8 of the Clayton Act, and in particular, interlocks involving private equity ("PE") firms and technology companies. On March 9, 2023, (...)

Mark J. Gidley, George Paul, Rebecca Farrington (Hilberman), Martin M. Toto, Heather Greenfield, Daniel J. Rosenthal, Naari Ha The US FTC announces annual changes to the Hart-Scott-Rodino Act notification thresholds


On January 21, 2022, the Federal Trade Commission (FTC) announced the annual changes to the Hart-Scott-Rodino (HSR) Act notification thresholds. The FTC is required by law to revise the jurisdictional thresholds annually, based on the change in gross national product. Accordingly, the 2022 (...)

Heather Greenfield, Mark Powell, Nicholas Putz, George Paul, Rebecca Farrington (Hilberman), Axel Schulz, Jan Jeram The US DoJ and FTC implement policies in response to COVID-19 including new measures to the HSR e-filing system


Last week, in response to the outbreak of the Coronavirus disease (COVID-19), the antitrust agencies in the United States and European Union issued policies that will affect, and may delay, merger filings and reviews. On March 13, 2020, the US Department of Justice (“DOJ”) and Federal Trade (...)


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