Margaret Duncan

Title/s:  Adjunct Professor

Phone: 773.805.0354



Margaret M. Duncan is an adjunct Professor at Loyola University Chicago School of Law, where she teaches Patent Law and Business Clinics I and II. Previously, she practiced at McDermott Will & Emery for 28 years, including as a partner in the Intellectual Property practice group, where she was head of the Chicago IP practice for 12 years and focused her practice on all aspects of intellectual property law, including patent, trademark, trade secret and copyright protection, litigation, and transactions.

Professor Duncan is a member of the Illinois Bar and is admitted to practice in numerous federal district and appellate courts and the U.S. Supreme Court. During her practice at McDermott, she was consistently ranked by Best Lawyers, Chambers USA, and World Trademark Review, as a leading lawyer in IP law. In 2018, Leading Lawyers Magazine ranked her in the Top 10 IP attorneys in Illinois.

During law school at Loyola, she won first place in the Giles Sutherland Rich Moot Court Competition, Midwest Region, and first runner-up in the national competition. She also externed for Chief Judge James Benton Parsons in the U.S. District Court for the Northern District of Illinois.

She served as 2018-19 president of the Richard Linn American Inn of Court and continues to serve on its Executive Committee. She is vice-chair of the Intellectual Property Law Association of Chicago’s Amicus Committee and a member of the Enforcement Committee of the International Trademark Association (INTA). She also served on INTA’s Amicus Committee, U.S. Subcommittee from 2016-19. She is a founding member of Human Rights Watch’s Chicago Committee and is one of its Chairs Emerita.


BS, Xavier University
BS, Indiana University
JD, Loyola University Chicago School of Law

Program Areas

Intellectual Property Law

Patent Law

Trademark and Unfair Competition Law

Copyright Law

Trade Secret Law

Courses Taught

Patent Law

Business Law Clinic I

Business Law Clinic II

Selected Publications

Delaware Lawyer, Vol. 38, No. 3, Delaware Bar Foundation, Topics in Intellectual Property: “The Supreme Court’s Booking.com Decision,” Summer 2020