Leigh Oliver is partner in Clifford Chance's Washington D.C. office, Co-Chair of the firm's Healthcare & Life Sciences sector group, and Head of the US Antitrust practice. She 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. Leigh is particularly commended for her work in healthcare-related antitrust matters.

Leigh is a member of the Council of the ABA Antitrust Section and a Member of the American Health Lawyers Association. Among her accolades, she has been ranked among the top lawyers for US Antitrust by Chambers USA from 2021 – 2025.

Leigh obtained her JD from The Catholic University of America, Columbus School of Law in 2004 and her BA in Political Science from Haverford College in 2000. She was admitted as Attorney-at-Law in the District of Columbia in 2004.