FacultyFaculty/Author Profile

Margaret M. Zwisler

Latham & Watkins LLP

Washington, DC, USA

Peggy Zwisler is a partner in the Litigation Department of Latham & Watkins' Washington, D.C. office. She is the immediate past Global Co-chair of Latham's nationally recognized Antitrust & Competition Practice.

Ms. Zwisler is an antitrust litigator with more than 35 years of experience. She has successfully represented antitrust defendants in numerous trials and achieved significant victories for them through both procedural and substantive dispositive motions. She is nationally recognized as one of the leading class action defense lawyers in the country, and has represented companies in antitrust class actions that involve, among other products, motor vehicles, chemicals, artificial teeth, contact lenses, graphics processing units, residential doors, grain, smokeless tobacco, insulation, pharmaceuticals and plumbing fixtures.

Recently, Law360 named Ms. Zwisler to its list of the 15 top female trial attorneys in the country. The Legal 500 US has twice listed Ms. Zwisler as one of the ten leading antitrust litigation lawyers in the United States, calling her “a very skilled practitioner” and noting that she is "lauded by clients for her skills in the courtroom.” She has been named a leading attorney in Chambers USA, Euromoney Benchmark Litigation and Global Competition Review's “Who's Who of International Competition Lawyers” as well as on its list of “Leading Women in Antitrust.” Ms. Zwisler was named one of the leading lawyers in the United States and one of the country's leading trial lawyers by Lawdragon Magazine, and the Legal Times named her as one of the leading business litigators in the Washington, D.C. area. In 2012, Ms. Zwisler was named a “Client Service All-Star,” in BTI Consulting Group’s annual survey of US corporate leaders asked to identify lawyers that represent client service excellence. Additionally, Ms. Zwisler was selected for inclusion on the 2013 Washington, D.C. Super Lawyers list which recognizes individuals who have distinguished themselves in their legal practice.

Bar Qualification

District of Columbia


JD, George Washington University Law School, 1976
High Honors

BA, Saint Mary's College, Notre Dame, Indiana, 1971
cum laude


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