Mark Finkelstein is a partner at Umberg/Zipser with more than 25 years of intellectual property and complex litigation experience. He advises clients on matters involving patent, copyright, trademark, and trade dress infringement, as well as misuse of trade secrets, unfair competition, and other commercial disputes. Mark has significant first-chair trial experience in both state and federal courts, and has argued before the Federal and Ninth Circuits.

Mark has been recognized in the fields of Commercial Litigation, Intellectual Property Litigation, Patent Litigation and Trademark Law by Best Lawyers in America since 2016. He was also twice recognized as the Lawyer of the Year in Orange County for Trademark Law (2021 and 2023), and was recognized as the 2023 Lawyer of the Year in Orange County in Patent Litigation. He has been listed in Southern California Super Lawyers since 2009. Further, Legal 500 and World Trademark Review have recommended Mark for trademark litigation, with World Trademark Review calling Mark “a bright, experienced litigator” with an “imposing courtroom presence” and “extensive first-chair trial experience before the federal courts,” adding that he is “one of the smartest guys you would probably ever meet.”

Mark is a past president of the Association of Business Trial Lawyers (ABTL) Orange County and was a Lawyer Representative to the Ninth Circuit Judicial Conference. 

Mark has written articles on patent reform, cybersquatting, and trade dress infringement and has spoken on intellectual property protection, patent infringement, and electronic discovery. He has been a member of the American and Orange County Bar Associations, the American Intellectual Property Law Association, and the Orange County Intellectual Property Law Association.

Prior to joining Umberg/Zipser, Mark was a partner with international law firms Jones Day and Latham & Watkins.