Irell & Manella LLP

Described in Chambers USA as having “a remarkable ability to come up with creative solutions,” Jason Sheasby 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, higher education and healthcare.

As an example of the wide diversity of his practice, in a single year, Jason was hired by a client post-trial to successfully reverse the largest patent verdict in history ($2.5 billion in a medicinal chemistry matter) and also obtained a $400 million jury verdict against the largest semiconductor manufacturer in the world.

In another 12-month period, Jason obtained findings of infringement, validity and willfulness in each of three separate jury trials, with verdicts totaling more than $800 million. In the most recent one, he secured a $500 million verdict against Apple for damages over a period of 19 months in the first patent jury trial of the COVID-19 pandemic. The jury also found that Apple was willful and must pay an ongoing royalty. During this same period, Jason obtained a dismissal with prejudice of a multi-count antitrust and unfair competition complaint that accused his client and others of participating in a cartel and group boycott.

As another example in a single 10-month period, Jason obtained three plaintiffs verdicts in total excess of $600 million, as well as a permanent injunction, and prevailed as a defendant in three cases alleging breach of contract and fraud, two tried to the bench and one resolved on summary judgment.

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

Jason is repeatedly named in industry awards including The American Lawyer's "Litigator of the Year," the Daily Journal’s “Top 100 Lawyers” and “Top IP Lawyers,” The National Law Journal’s “Winning Litigators” list and Law360’s “Trial MVPs.”