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
Co-Chair of the ABA Antitrust Section's Committee Operations, American Bar Association
Member of the American Health Lawyers Association (AHLA)
adjunct professor at The George Washington University Law School
2025 Lawdragon 500 Leading Litigators in America
Awards and citations
Recommended for Competition: Global Leaders Who's Who Legal, 2023
"Leigh Oliver is particularly commended for her work in healthcare-related antitrust matters. She regularly appears before the FTC in merger investigations and challenges." Band 5, Chambers USA: Antitrust, 2021-2023
Ranked as a Washington D.C. Super Lawyer, 2023
Ranked as a Leading Litigator in America Lawdragon 500 2023: Antitrust Clearance & Litigation
Leigh Oliver is particularly commended for her work in healthcare-related antitrust matters. She regularly appears before the FTC in merger investigations and challenges. Sources say, "She is extraordinarily attentive to detail and to strategy, an excellent team leader and very responsive to client needs." Chambers USA 2021: Antitrust (District of Columbia)
Ranked as Next Generation Partner Legal 500 USA 2019-2023, Healthcare: Advice to Service Providers
Competition: Future Leaders, Most Highly Regarded, Who's Who Legal, 2017-2021
40 in their 40s: Notable Women Competition Professionals in Americas, W@, 2019
Lawyer of the Year - Under 40, Global Competition Review (GCR), 2017
Competition, Who's Who Legal, 2017
Mergers and Acquisitions Trailblazer, National Law Journal, 2016
Clifford Chance
