Described in Chambers USA as having "a remarkable ability to come up with creative solutions," Jason Sheasby is a partner in the Los Angeles office of Irell & Manella, where his practice focuses on complex litigation, patents, trade secrets, antitrust, regulatory compliance and internal investigations. His experience spans a wide range of industries, including bio/pharmaceuticals, medical devices, semiconductors, telecommunications, electronics, universities, and health care. 

At the age of 37, Mr. Sheasby was appointed to a seat on the firm’s governing body, the Executive Committee, making him the youngest partner at Irell to hold this position. 

Mr. Sheasby is regularly selected for inclusion in industry honors lists. The National Law Journal selected him as one of the 2018 Winning Litigators. The Daily Journal named him one of California's “Top 100 Lawyers” in 2017 and among the "Top IP Litigators" in 2015. In 2013, Law360 named Mr. Sheasby a "Rising Star" and a “top legal talent under 40.” He is also consistently recognized as a leading intellectual property litigator in publications such as Chambers USA, Benchmark Litigation, The Legal 500, Managing Intellectual Property's "IP Stars" and IAM Patent 1000

Representative Trials:

  • Obtained a $400-million jury verdict for KAIST in a patent infringement trial against Samsung, GlobalFoundries and Qualcomm in U.S. District Court for the Eastern District of Texas. The suit involved a fundamental patent relating to bulk FinFET technology. The jury also found that Samsung’s infringement was willful. All claims were found infringed by all parties, and all claims were held valid. The verdict garnered heavy media attention from outlets including and Law360.
  • Obtained a defense verdict for Gilead Sciences in a contract litigation over whether Gilead owed a bonus payment under a merger agreement related to Gilead's cancer-fighting PI3K inhibitor Zydelig. Following a trial, the Delaware Court of Chancery issued a complete defense verdict, rejecting the plaintiff's claim for over $50 million in damages. The Delaware Supreme Court affirmed the verdict.
  • Obtained a judgment that multiple patents were valid and infringed, and received a damages award in excess of $145 million, after defeating an IPR challenge. The judgment was affirmed on appeal.
  • Managed a complex multi-district litigation involving dozens of patents and hundreds of counterclaims. The defendants in the suit were the largest cable companies in the US. The suit lead to Cisco, the dominant supplier in the industry, making the largest payment in Cisco’s history, over $180 million, to his client to settle the suit.  
  • Obtained a judgment that a licensee who had already paid in excess of $80 million in royalties had materially and intentionally breached the license by manipulating technical data, allowing his client to terminate the agreement and expose the licensee to patent infringement liability.  
  • Mr. Sheasby and other Irell attorneys took over after claim construction a patent infringement case brought by the Wisconsin Alumni Research Foundation against Intel’s most advanced computer microarchitecture. Irell obtained summary judgment disposing of Intel’s defense that it had a license to the patent based on funding it provided to the University of Wisconsin, and received a revised claim construction that allowed WARF to defeat summary judgment of anticipation. Intel settled the case three days before trial for $110 million.
  • As counsel for the patentee, the case settled three days before trial, and right after the judge affirmed the right of the patentee to seek in excess of $700 million in damages.

Representative Intellectual Property Litigations:

  • Mr. Sheasby puts particular emphasis on litigating patents involving as wide an array of technologies as possible, including medicinal chemistry, genomics, polymer chemistry, antibody humanization, recombinant drug expression, fusion proteins, optics, computer microarchitecture, materials science, and semiconductor packaging.

Representative Internal Investigations and Regulatory Compliance Matters:

  • Mr. Sheasby has conducted internal investigations relating to Health and Human Services regulatory compliance, including improper use of research funding, and pricing and anti-kickback investigations, as well as improper use of competitor trade secrets.

Post-Grant Review Proceedings:

  • Mr. Sheasby is routinely retained for complex PTO post-grant review proceedings that involve large numbers of experts, and complex administrative law questions. He has prevailed on IPR challenges to patents in a wide variety of industries, including medicinal chemistry, semiconductor packaging technology, computer microarchitecture, telecommunications and computer security. Prevailing on these patents blocked generic entry into a drug market, and protected royalty payments in excess of $700 million.  

While at Harvard Law School, Mr. Sheasby was a research assistant for Professor Arthur Miller and helped to revise Federal Practice & Procedure, the leading treatise on civil procedure.  

Mr. Sheasby is a frequent lecturer on intellectual property, including for the World Intellectual Property Organization and the National Association of College and University Attorneys.

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Bar & Court Admissions

  • California
  • U.S. Court of Appeals, Federal Circuit
  • U.S. District Court, Central and Northern Districts of California