Daniel Rosenthal is partner in the Washington, D.C., office of Kirkland & Ellis LLP. Daniel is widely considered a “go-to” practitioner for government merger and non-merger investigations, as well as counseling on antitrust issues, with a proven track record advising clients on complex cross-border transactions with multiple merger clearance requirements. He has broad experience handling complex antitrust issues in a variety of industries, including healthcare, pharmaceuticals, biotechnology, manufacturing, oil & gas, solid waste, transportation, automobile components, semiconductors, software, hardware, chemicals, publishing, renewable energy, entertainment and retail sales.
Daniel has successfully defended non-merger investigations, including investigations of violations of Section 8 of the Clayton Act, and has advocated for government intervention on behalf of parties adversely impacted by proposed mergers. He also advises clients on issues relating to the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR Act), as well as international merger notification requirements. Clients turn to Daniel on a variety of antitrust risk management issues relating to business initiatives such as joint ventures, pricing and distribution strategies, information and data-sharing, and trade association and industry-wide collaborative efforts.
From 2022–2024, The Legal 500 United States named Daniel a “Recommended Lawyer for Antitrust.” In spring 2023, Daniel was recognized by Mondaq with a Thought Leadership Award for Antitrust/Competition Law. He is also an active speaker and writer on antitrust matters, having hosted numerous CLE courses and authored and co-authored several articles and publications, including the U.S. chapter of Merger Control, a comparative guide published by The Legal 500 United States (2018–2021). Daniel regularly serves as a guest lecturer on the intersection of antitrust and M&A for “International Business Transactions” at the George Washington University Law School and has also hosted multiple programs offered by MyLawCLE in conjunction with the Federal Bar Association on a variety of topics including “Iceberg Ahead! A Primer on HSR in M&A and what the sweeping proposed HSR changes mean for your deal” and “Safe Harbors to Troubled Waters? Heightened Antitrust Scrutiny of Labor Markets.” Daniel has also appeared on the ABA’s Our Curious Amalgam podcast and at conferences to discuss the 2025 updates to the HSR rules and its impact on parties to transactions.
