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.