Mary Mazzello

Mary Mazzello is an Intellectual Property Litigation Partner at Kirkland & Ellis LLP, primarily focusing on trademark, copyright, trade secret, and music royalty disputes across a diverse range of industries, including technology, sports, AI, entertainment, and consumer goods. While the provided case list includes a single appearance as counsel in an "Untitled case" on the defendant side, public descriptions of her practice consistently highlight her expertise in non-patent intellectual property matters. Her work encompasses both litigation in state and federal courts, as well as pre-litigation counseling, branding, new product launches, and IP acquisition and licensing issues.

Mazzello's litigation practice generally involves defending operating companies, aligning with her single tracked defendant-side appearance. She has been with Kirkland & Ellis since she began her legal career as a summer associate, and is based in the firm's New York office.

Her notable achievements include securing a 9-0 victory for Lucky Brand Dungarees before the United States Supreme Court in a trademark dispute, as well as winning summary judgment and appeals in trademark cases for prominent technology companies before the Second and Ninth Circuits. She has successfully defended leading music streaming services in copyright infringement class actions, with plaintiffs dropping claims, and served as trial counsel in complex music copyright royalty proceedings before the U.S. Copyright Royalty Board. Mazzello also defeated a preliminary injunction motion for Equinox Holdings in trademark and false advertising litigation and represented Apple in an appeal concerning the "Smart Keyboard" trademark. Additionally, she represented Dollar Shave Club, successfully defeating a temporary injunction motion and invalidating a non-compete clause in trade secret litigation.

While her practice does not primarily involve Inter Partes Reviews (IPR) or proceedings before the Patent Trial and Appeal Board (PTAB), Mazzello has experience litigating trademark disputes before the Trademark Trial and Appeal Board (TTAB), including winning a reversal of a TTAB decision. She was admitted to practice in New York in 2012, having earned her J.D. cum laude from Harvard Law School in 2011 and a B.A. in Economics with Honors from Washington University in St. Louis in 2003.