Peter T. Holsen

Peter T. Holsen is a partner at Andrus Intellectual Property Law and a registered patent attorney with decades of experience advising clients on all aspects of intellectual property. He provides strategic guidance on patents, trademarks, copyrights, and complex IP transactions for domestic and international clients across various industries.

Peter holds both a B.S. in Civil Engineering and a J.D. from Marquette University. During law school, he served as Editor-in-Chief of the Intellectual Property Law Review. Before entering the legal field, he worked as a lead engineer for a global consulting firm, managing large-scale projects for electrical and petrochemical facilities.

As a legal advisor, Peter offers end-to-end patent and trademark services—from drafting and prosecuting applications to providing infringement and validity opinions. He regularly counsels clients on the development of IP strategies and has even served as part-time in-house counsel for a Fortune 500® company, aligning legal protection with business objectives.

Peter is admitted to practice before the U.S. Patent and Trademark Office, the U.S. Supreme Court, and multiple federal and district courts, including the U.S. Court of Appeals for the Federal Circuit. His ability to translate complex engineering concepts into strong intellectual property protections has earned him the trust of innovators and businesses alike.

Peter’s technical experience spans a broad range of technologies, including marine propulsion systems, engines, fluid systems, robotic devices, packaging machinery, and medical imaging tools. He is consistently recognized for excellence, including selection to the IAM Patent 1000 (2014–2023), Wisconsin Super Lawyers (2016–2023), and as a Thomson Reuters Stand-Out Lawyer (2021–2023).

Known for responsiveness, service-mindedness, and deep technical knowledge, Peter T. Holsen helps clients secure and defend intellectual property that supports long-term innovation and growth. His dedication to technical precision and legal clarity makes him a trusted advocate in the evolving landscape of intellectual property law.

Law Office Affiliations

• Partner, Andrus Intellectual Property Law, LLP

Licensed State

• Wisconsin

Education

• Marquette University Law School
  Juris Doctor (JD)
• Marquette University College of Engineering
  Bachelor of Science (BS)

Awards & Badges