Partner, Co-Head of the Healthcare and Life Sciences Sector and Head of US Antitrust Practice
Partner, Co-Head of the Healthcare and Life Sciences Sector and Head of US Antitrust Practice
Leigh Oliver (She/Her)
Leigh Oliver is Head of the US Antitrust Practice, Co-Head of the Healthcare & Life Sciences Sector and specializes in antitrust issues ranging from bet-the-company merger control matters to state and federal antitrust investigations. She has two decades of experience advising clients in heavily scrutinized industries, including healthcare, life sciences, aerospace and defense and industrials. She regularly represents clients before federal and state antitrust agencies and in merger litigation in federal court.
Mondelēz International in the sale of its gum business to Perfetti Van Melle
UnitedHealth Group and its subsidiary Optum on various matters, including the successful defense of its acquisition of Change Healthcare which was challenged by U.S. Department of Justice Antitrust Division
Laboratory Corporation of America with respect to numerous transactions
Alcon in various transactions
Einstein Health Network in its 2020 merger with Thomas Jefferson University
Beaumont Health in its merger with Spectrum Health
Aspirus Inc. in its acquisition of Ascension hospitals in Wisconsin
Penn State Health in its acquisition of Geinsinger’s Holy Spirit Hospital
Atrium and Wake Forest Baptist Medical Center in their combination
UW Health and UnityPoint in their combination of provider and plan businesses
PPG, Inc. in various transactions and matters
Gencorp-Aerojet in its acquisition of Pratt & Whitney Rocketdyne
The Catholic University of America, Columbus School of Law (JD) 2004
Admitted as Attorney-at-Law in the District of Columbia 2004
Joined Clifford Chance as a Partner 2022
Professional
bodies
Member of the Council of the ABA Antitrust Section
Member of the American Health Law Association (AHLA). She has been She was also listed in the 2025 edition of Lawdragon 500 - Leading Litigators in America.
2025 Lawdragon 500 Leading Litigators in America
Awards and citations
Ranked among the top lawyers for Antitrust by Chambers USA for four consecutive years from 2021 – 2024
Recommended for Competition: Global Leaders in Who's Who Legal, 2024
Clifford Chance
