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Leigh L. Oliver

Washington, D.C.

Leigh L. Oliver

From strategic transactions to government investigations, Leigh Oliver helps companies step through their most difficult antitrust issues. 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 working with clients in some of the most heavily scrutinized industries, including healthcare, life sciences, and aerospace and defense. Her tireless work ethic and ability to build relationships with witnesses and clients to gain in-depth understanding of competitive market dynamics creates the formula for a winning strategy. Leigh was named "Lawyer of the Year – Under 40" by Global Competition Review (GCR) in 2017 and a Mergers & Acquisitions (M&A) and Antitrust Trailblazer by the National Law Journal for her work in 2016.

She has played a critical role in defending healthcare providers in multiple FTC merger investigations and challenges, including the FTC challenge to the merger of Advocate Health Care and NorthShore University HealthSystem and in LabCorp v. FTC, which was named the 2011 "Litigation of the Year" by GCR. She is a Co-Chair of the ABA Antitrust Section’s Healthcare and Pharmaceuticals Committee and a member of the American Health Lawyers Association.

Representative experience

Represented UW Health and UnityPoint Health in their proposed combination of healthcare provider and insurer services in Wisconsin.

Counsel to Advocate HealthCare in litigating the defense of its 2016 proposed merger with NorthShore University HealthSystem.

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.

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

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

Antitrust 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
  • Member, American Bar Association (ABA)  
  • Member, American Health Lawyers Association (AHLA)

Bar admissions and qualifications

  • District of Columbia
  • Maryland


Lawyer of the Year - Under 40

Global Competition Review (GCR)


Antitrust: Merger Control

Legal 500 US



Who's Who Legal


Competition: Future Leaders

Who's Who Legal


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


Merger & Acquisitions (M&A) and Antitrust Trailblazer

National Law Journal

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