Mark Marciszewski represents clients within the entertainment, media, fashion, and technology industries, bringing significant experience in copyright, trademark, breach of contract, and First Amendment litigation and counseling. He has handled disputes in state and federal courts across the country in all stages of litigation, including pre-litigation counseling and risk assessment, written and expert discovery, depositions, motion practice, mediations, trials, and appeals.
Mark has extensive knowledge and experience with copyright policy and disputes, both in traditional media and disruptive technologies. In 2026, he served as counsel in two of the most notable copyright cases of the year. In addition to litigating multiple precedential copyright cases and counseling clients regarding new and proposed legislation, Mark has published six law review articles focusing on novel issues of copyright and antitrust law within the entertainment, media, and technology industries. His articles have been recognized as among the most important and timely on their subjects, and as such, have been cited dozens of times in amicus briefs and other articles. Mark leverages this knowledge in addition to his trial experience to develop case strategies and communicate his client's interests in order to achieve the best outcomes for his clients, whether it is by early resolution or obtaining favorable judgments through dispositive motions, oral argument, or at trial.
Prior to joining Jenner & Block, Mark spent time as a copyright and trademark litigation associate with an AmLaw 50 firm as well as a boutique IP firm. He also served as a federal law clerk for the Honorable Anne T. Berton in the United Stated District Court for the Western District of Texas. During law school, Mark externed at National Public Radio and served on the board of the Virginia Sports & Entertainment Law Journal and the Journal of Law & Politics.
Representative Matters
- Won a complete denial of preliminary injunction in the Eastern District of Missouri on behalf of a leading building code publishing platform, establishing that publishing safety guidelines adopted into law by state and local governments on a website is not copyright infringement — a ruling that led the plaintiff to voluntarily dismiss the case.
- Won a complete denial of preliminary injunction in the Eastern District of Pennsylvania — affirmed by the Third Circuit — on behalf of a leading building code publishing platform, establishing that publishing privately authored standards incorporated by reference into laws adopted by state and local governments is neither copyright nor trademark infringement.
- Defeated state and federal trademark and unfair competition claims in the Western District of Washington on behalf of a major e-commerce company, securing summary adjudication that foreclosed any monetary recovery and striking the plaintiff's jury demand, leading to a favorable settlement.
- Secured a favorable jury verdict in a landmark DMCA case in the District of Connecticut on behalf of a leading online education technology company, reducing a multibillion-dollar DMCA statutory damages claim to less than 1% of the amount the plaintiff sought.
Credentials
Service / Recognition
Overview
Mark Marciszewski represents clients within the entertainment, media, fashion, and technology industries, bringing significant experience in copyright, trademark, breach of contract, and First Amendment litigation and counseling. He has handled disputes in state and federal courts across the country in all stages of litigation, including pre-litigation counseling and risk assessment, written and expert discovery, depositions, motion practice, mediations, trials, and appeals.
Mark has extensive knowledge and experience with copyright policy and disputes, both in traditional media and disruptive technologies. In 2026, he served as counsel in two of the most notable copyright cases of the year. In addition to litigating multiple precedential copyright cases and counseling clients regarding new and proposed legislation, Mark has published six law review articles focusing on novel issues of copyright and antitrust law within the entertainment, media, and technology industries. His articles have been recognized as among the most important and timely on their subjects, and as such, have been cited dozens of times in amicus briefs and other articles. Mark leverages this knowledge in addition to his trial experience to develop case strategies and communicate his client's interests in order to achieve the best outcomes for his clients, whether it is by early resolution or obtaining favorable judgments through dispositive motions, oral argument, or at trial.
Prior to joining Jenner & Block, Mark spent time as a copyright and trademark litigation associate with an AmLaw 50 firm as well as a boutique IP firm. He also served as a federal law clerk for the Honorable Anne T. Berton in the United Stated District Court for the Western District of Texas. During law school, Mark externed at National Public Radio and served on the board of the Virginia Sports & Entertainment Law Journal and the Journal of Law & Politics.
Areas of Focus
Representative Matters
- Won a complete denial of preliminary injunction in the Eastern District of Missouri on behalf of a leading building code publishing platform, establishing that publishing safety guidelines adopted into law by state and local governments on a website is not copyright infringement — a ruling that led the plaintiff to voluntarily dismiss the case.
- Won a complete denial of preliminary injunction in the Eastern District of Pennsylvania — affirmed by the Third Circuit — on behalf of a leading building code publishing platform, establishing that publishing privately authored standards incorporated by reference into laws adopted by state and local governments is neither copyright nor trademark infringement.
- Defeated state and federal trademark and unfair competition claims in the Western District of Washington on behalf of a major e-commerce company, securing summary adjudication that foreclosed any monetary recovery and striking the plaintiff's jury demand, leading to a favorable settlement.
- Secured a favorable jury verdict in a landmark DMCA case in the District of Connecticut on behalf of a leading online education technology company, reducing a multibillion-dollar DMCA statutory damages claim to less than 1% of the amount the plaintiff sought.
Credentials
Admissions
- California, 2022
- Florida, 2021
Education
- University of Virginia School of Law, JD, 2020
- University of Central Florida, BS, magna cum laude, 2017
Court Admissions
- US District Court, Central District of California, 2022
- US District Court, Northern District of California, 2025
Clerkships
- Hon. Anne T. Berton, US District Court, Western District of Texas, 2020-2022
Service / Recognition
Industry
- Copyright Society, Member, 2023-present
- California Lawyers Association, Intellectual Property Law Section, Member, 2023-present
- Los Angeles Intellectual Property Law Association, Member, 2023-present
- The Florida Bar Entertainment, Arts, & Sports Law Section, Member, 2021-present
- Association of Business Trial Lawyers, Member, 2025-present