Marc Aaron Fenster

Marc Aaron Fenster is a prominent patent litigator specializing in high-technology disputes, particularly within software, data processing, and various engineering fields. His extensive background includes undergraduate and graduate studies focusing on areas such as mass transfer, biochemistry, microbiology, biomechanics, mechanical engineering, and computer programming, which underpins his work in complex technical cases. Fenster primarily represents plaintiffs, aligning with owners of significant patent portfolios and demonstrating a track record of securing substantial damages for his clients.

Fenster is the co-chair of the Litigation Department and chair of the Patent Litigation department at Russ August & Kabat, a department he founded in 2003. Before joining Russ August & Kabat, he was a lawyer at Irell & Manella LLP from 1995 to 2003. He has been counsel in several high-profile cases, including Realtime Data LLC v. Reduxio Systems, Inc. et al. before the Federal Circuit, which involved patents related to digital data compression. More recently, Fenster led trial teams to significant victories, including a $175 million jury verdict against Verizon for data saving technology in Headwater Research LLC v. Verizon (EDTX 2025), a $279 million jury verdict against Samsung for wireless push messaging technology in Headwater Research LLC v. Samsung (EDTX 2025), and a $262 million jury verdict against Western Digital for magnetic recording media in MR Technologies v. Western Digital (CDCA 2024). He also secured a $122 million jury verdict against Amazon in Almondnet v. Amazon, Inc. for targeted offsite advertising and achieved a settlement against Apple concerning mobile camera and image processing patents for Corephotonics.

While his professional profiles indicate a focus on patent litigation in district courts and at the Federal Circuit, specific details regarding his regular appearance in PTAB / IPR proceedings are not explicitly stated in publicly available sources. Marc Aaron Fenster has been admitted to the State Bar of California since 1995, and he earned his law degree from UCLA School of Law following his undergraduate studies at the University of California San Diego.