Mr. Liss is experienced in trademark, copyright, trade secret and unfair competition counseling and litigation. He has significant experience in complex inter partes proceedings before the Trademark Trial and Appeal Board (TTAB), and has represented numerous clients in federal courts around the U.S.
Mr. Liss represents clients in a wide variety of industries including health care, consumer goods and products, insurance and financial services, industrial and commercial products and online retail sales. Much of his practice is in litigation and trademark counseling. He has represented clients in lawsuits throughout the United States and inter-parties Trademark Office proceedings. He has acted as first chair in numerous trials and Trademark Office contested matters.
In addition to his litigation practice, Mr. Liss has extensive experience in trademark counseling. For example, he has provided detailed counseling, search advice and protectability opinions regarding global name trademark availability and protection issues. In fact, he has provided detailed consulting services in connection with spin-offs from Fortune 100 companies who were forming new and independent companies on a worldwide basis. Mr. Liss currently serves as Vice President of the firm.
Honors
- Listed in The Best Lawyers in America® in the area of Trademark Law, 2013-2017, 2023-2026
- Recognized as a top Illinois trademark lawyer by the World Trademark Review 1000, 2011-2026
- Named in the Illinois Super Lawyers list, Intellectual Property Litigation, 2012-2025
- Selected as a Top Attorney in Illinois by The American Registry, 2023
- Recognized by Managing IP as an Trademark Star, 2022-2025
- Awarded a Client Choice award for Intellectual Property – Trademarks
- Selected as a 2019 Global Leader by the World Trademark Review 1000
- Recognized as a leading IP practitioner by World IP Review’s WIPR Leaders, 2017-2018, 2022
- Named IP Attorney of the Year 2018 – Illinois by Acquisition International’s Excellence Awards
- Awarded Albert Nelson Marquis Lifetime Achievement Award – Marquis Who’s Who
- Selected by peers as a Leading Lawyer in Intellectual Property Law – Leading Lawyers Network
- Listed among the Top Lawyers in Illinois in Intellectual Property Law – Chicago Lawyer
- AV® Preeminent™ Peer Review Rated (Highest Rating) – Martindale-Hubbell
Professional Affiliations
- Intellectual Property Owners Association (IPO)
- International Trademark Association (INTA)
- Oral argument judge for INTA Saul Lefkowitz Moot Court Competition (2011)
Articles, Publications & Lectures
- What You Need to Know About Filing an Infringement Lawsuit for a Nontraditional Mark in the U.S. Court of Appeals for the Seventh Circuit, INTA Bulletin: October 1, 2017 Vol. 72, No. 17
- Featured Speaker, United States – Litigation Presentation at 2017 INTA Leadership Conference
- Featured Speaker- INTA Paralegal Forum- Arlington, Virginia, subject: likelihood of confusion in trademark cases
- Various presentations on trademark, trade dress and copyright issues made to clients
- Guest commentator- WBBM Radio addressing current copyright and internet related issues.
Practices
Insights
- Leydig Named Top Firm in World Trademark Review 1000
January 29, 2026 - Leydig Attorneys Named The Best Lawyers in America® for 2026
August 21, 2025 - Leydig Recognized by Managing IP
June 5, 2025 - Leydig Attorneys Attend INTA Annual Meeting in San Diego, CA
May 21, 2025 - Leydig Named Top Firm in World Trademark Review 1000
January 30, 2025 - Leydig Attorneys Named 2025 Illinois Super Lawyers
January 21, 2025 - Leydig Attorneys Named The Best Lawyers in America® for 2025
August 15, 2024 - Leydig Attorneys Named 2024 Illinois Super Lawyers
February 1, 2024 - Leydig Wins Appeal at Third Circuit involving Trade Dress for Candy Company Haribo
September 11, 2023 - Leydig Attorneys Named The Best Lawyers in America® for 2024
August 18, 2023 - Leydig Named Top Firm in World Trademark Review 1000
March 8, 2023 - Leydig Attorneys Named 2023 Illinois Super Lawyers
January 26, 2023 - Leydig Wins Summary Judgment for Candy Company Haribo
November 23, 2022 - Leydig Attorneys Named Best Lawyers by U.S. News
August 25, 2022 - Leydig Attorneys Named 2022 Illinois Super Lawyers
January 26, 2022 - Leydig attorneys named Best Lawyers by U.S. News
August 19, 2021 - Leydig Attorneys Named 2021 Illinois Super Lawyers
January 26, 2021 - Mark Liss named in AI Global 2020 Leading Advisor Awards
September 15, 2020 - Leydig attorneys named Best Lawyers by U.S. News
August 20, 2020 - Leydig ranked in Managing IP Trademark Stars
May 14, 2020 - Leydig attorneys named in Best Lawyers
February 28, 2020 - Leydig Attorneys Named 2020 Illinois Super Lawyers
January 26, 2020 - Leydig Attorneys Listed in 2019 Edition of The Best Lawyers in America®
August 17, 2019 - Mark Liss Selected as a 2019 Global Leader by the World Trademark Review
July 8, 2019 - Mark Liss Named Recipient of 2019 Client Choice Award
February 15, 2019 - Leydig Ranked as Top Trademark Law Firm by the World Trademark Review
February 1, 2019 - Leydig Attorneys Named 2019 Illinois Super Lawyers
January 25, 2019 - Creating Valuable Client Outcomes in Trademark Law
September 5, 2018 - Leydig Attorneys Listed in 2018 Edition of The Best Lawyers in America®
August 17, 2018 - Mark Liss Named IP Attorney of the Year 2018 in Illinois
May 5, 2018 - Leydig Attorneys Named 2018 Illinois Super Lawyers
January 25, 2018 - Leydig Attorneys Named 2017 Illinois Super Lawyers
January 18, 2017 - Leydig Attorneys Named in Illinois Super Lawyers and Rising Stars 2016 Lists
December 4, 2015 - Leydig Attorneys Named in Illinois Super Lawyers and Rising Stars 2015 Lists
January 16, 2015