Sectors
A middle-aged man with gray hair and glasses wearing a dark pinstripe suit, white shirt, and patterned tie stands in a blurred corporate law office setting.

Mark A. Kassel

Partner

Mark Kassel provides counsel on a broad spectrum of patent, trademark, copyright, and licensing matters. His patent practice emphasizes biotechnical and chemical arts, including nanotechnology, pharmaceutical, and diagnostic products. Mark is a former chair of Foley’s Chemical, Biotechnology & Pharmaceutical Practice and previous head of the Madison office Intellectual Property Department. He is also a member of the firm’s Mechanical & Electromechanical Technologies and Trademark, Copyright & Advertising Practices as well as the Health Care & Life Sciences Sector and Food & Beverage Industry Team.

Mark has wide-ranging experience in both organic and inorganic chemical areas involving adhesives, polymers, pharmaceuticals, and alloys. He has extensive experience drafting agreements, including license agreements, joint venture agreements, consulting agreements, and distribution agreements. He also prepares patent validity and non-infringement opinions as well as conducts patent portfolio analysis.

Additionally, Mark provides counseling on all aspects of domestic and international trademark practice, including trademark registration and trademark enforcement. He represents the worldwide trademark interests of numerous clients. He also acts as primary copyright counsel for several businesses ranging from book publishers to software manufacturers.

Mark represents a broad range of clients, with a special focus on advising and counseling start-up companies in all aspects of intellectual property protection as well as legal issues associated with biotechnology asset valuation and management, venture capital, and licensing.

Awards and Recognition

  • Named to BTI Consulting Group’s coveted Client Service All Star Team (2017), this honor is bestowed upon individual attorneys who deliver outstanding client service according to corporate counsel interviewed at large organizations with U.S. $1B or more in revenue.
  • Selected by his peers for inclusion in The Best Lawyers in America© in the fields of Biotechnology and Life Sciences (2008, 2010-2024), Technology Law (2009, 2010-2024) and Patent Law (2011-2024).
  • Named the Best Lawyers® Patent Law “Lawyer of the Year” in Madison (2015, 2017, 2019, 2022, and 2024).
  • Named the 2016 Client Choice for his work with IP patents.
  • Recognized by the Legal 500 as a Leading Lawyer in patent prosecution (2010-2016) and as a Leading Lawyer in trademarks (2012).
  • Selected for inclusion in the 2005 and 2010 Wisconsin Super Lawyers® lists.
  • Named to the 2012-2022 and 2024-2026 editions of Chambers USA: America’s Leading Lawyers for Business in the practice areas of Intellectual Property.
  • Peer review rated as AV Preeminent®, the highest performance rating in Martindale-Hubbell® Peer Review Ratings™.
  • Named a Food and Drug Law Institute Scholar by the Food and Drug Law Institute.
  • Received more than two dozen honors and awards during law school, including being named a Duesenburg Endowed Scholar.
  • Named a WIPR Leader by World IP Review for his IP practice.

Affiliations

  • American Intellectual Property Law Association, member
  • Wisconsin Intellectual Property Law Association, member
  • National Association of Patent Practitioners, member
  • Licensing Executives Society, member
  • American Chemical Society, member
  • Society for Microbiology, member
  • American Association for the Advancement of Science, member
October 9, 2026 Upcoming Events

22nd Annual IP Conference

Foley & Lardner LLP is back in Boston for our 22nd Annual IP Conference! Join us on Friday, October 9, 2026, for a full day of insightful discussions led by industry voices from across the corporate and intellectual property landscape. This premier event will explore emerging trends, best practices in IP management, and key legal considerations, providing a valuable opportunity to:
June 4, 2026 Press Releases

Foley Achieves Top Rankings in Chambers USA 2026

Foley & Lardner LLP is proud to once again be recognized by Chambers & Partners as one of the leading law firms in the country in the 2025 edition of Chambers USA: America’s Leading Lawyers for Business.
September 5, 2025 Honors and Awards

Mark Kassel and Richard McKenna Named to Wisconsin IP Power List

Foley & Lardner LLP partners Mark Kassel and Richard McKenna are named to the Wisconsin Law Journal's IP Powerlist.
October 24, 2025 Events

21st Annual IP Conference

June 5, 2025 Press Releases

Foley Secures Top Rankings in Chambers USA 2025

Foley & Lardner LLP is proud to once again be recognized by Chambers & Partners as one of the leading law firms in the country in the 2025 edition of Chambers USA: America’s Leading Lawyers for Business.
August 19, 2024 Deals and Wins

Foley Represents Sun World International in Acquisition of Biogold

Foley & Lardner LLP served as principal legal advisor to Sun World International, LLC in its recent strategic acquisition of Biogold Group, a significant South Africa-based global fruit variety rights manager.