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Leigh L. Oliver

Washington, D.C.

Leigh L. Oliver

Leigh Oliver, a partner at Hogan Lovells in Washington, D.C., helps companies step through their most difficult antitrust issues, from strategic transactions to government investigations. She represents clients before both state and federal antitrust enforcers on matters such as domestic and multijurisdictional mergers, joint ventures, and competitor collaborations.

Leigh is known in the antitrust bar for her experience working with clients in some of the most heavily scrutinized industries, including healthcare, life sciences, and aerospace and defense. In 2016, she was named an M&A Antitrust Trailblazer by the National Law Journal. That same year, Leigh was a key member of the trial team that successfully defended against the FTC challenge to the merger of Advocate Health Care and NorthShore University HealthSystem in the Northern District of Illinois. Previously, Leigh was also a key member of the winning defense team in LabCorp v. FTC, which was named "Litigation of the Year" at the 2011 Global Competition Review Awards. Leigh is known for her tireless work ethic, which helps her build important relationships with witnesses and clients to gain an in-depth knowledge of markets and competitive dynamics that is essential to her winning advocacy.

Leigh is a member of the American Health Lawyers Association and the American Bar Association. She is Co-Chair of the ABA Antitrust Section's Healthcare and Pharmaceuticals Committee and is a former Vice-Chair of the Transportation and Energy Committee.

Representative Experience

Counsel to Advocate HealthCare in defense of its 2016 merger with Northshore University HealthSystem.

Antitrust counsel for PPG Industries, Inc. in various transactions, including the acquisition of Akzo Nobel's architectural coatings business.

Counsel to LabCorp in various transactions, including defense of its challenged merger with Westcliff Medical Laboratories.

Counsel to Lahey Health and Winchester Hospital in a combination that was reviewed by the Massachusetts Health Policy Commission.

Represented GenCorp-Aerojet in its acquisition of Pratt & Whitney Rocketdyne, a transaction that was opposed by the FTC.

Counsel to Orbital Sciences in its heavily scrutinized acquisition of ATK.

Education and admissions


  • J.D., magna cum laude, The Catholic University of America, Columbus School of Law, 2004
  • B.A., Haverford College, 2000


  • Co-Chair, ABA Antitrust Section Health Care and Pharmaceuticals Committee
  • Former Vice-Chair, ABA Antitrust Section's Transportation and Energy Committee
  • Member, American Bar Association (ABA)  
  • Member, American Health Lawyers Association (AHLA)

Bar admissions and qualifications

  • District of Columbia
  • Maryland


Merger & Acquisitions and Antitrust Trailblazer

National Law Journal


Rising Star: Corporate, U.S. Northeast, U.S. South

Euromoney Legal Media Group's Americas Women in Business Law Awards


Outstanding Healthcare Antitrust Lawyer

Nightingale's Health Care News

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