WilmerHale

Firm overview:

A perennial force in high-stakes patent litigation, WilmerHale is widely regarded as one of the market’s most formidable courtroom practices. The firm deploys a deeply multidisciplinary approach, pairing seasoned trial lawyers with practitioners who bring advanced technical and scientific fluency to complex patent disputes. This model has proven highly effective across sectors, with the team regularly entrusted by leading players in technology, life sciences and other innovation-driven industries.

With a strong international footprint spanning the US, the UK and Germany, WilmerHale is well equipped to coordinate cross-border strategies in global patent disputes. Market observers consistently highlight the firm’s depth and consistency. As one peer notes: “They are strong across the board. They have excellent advocates, regardless of the nature of the dispute.”

Team overview:

Co-chair of the IP Litigation Practice Group, Mark Selwyn is a go-to adviser for many of Silicon Valley’s most prominent technology companies. His practice spans a broad range of technologies, from biomedical innovations to wireless communications, and he is frequently recognised for delivering decisive results in complex, business-critical matters.

Boston-based partner William (Bill) Lee is acknowledged as one of the pre-eminent trial and appellate lawyers of his generation. Having tried more than 200 cases to verdict, he has served as lead counsel in some of the most high-profile patent disputes of the past decade. A peer captures his standing succinctly: “He is a titan of the bar—brilliant, highly effective, and genuinely likeable. That combination is incredibly rare.” Lee has acted as lead trial counsel for Apple in a series of major matters against Intel and Qualcomm and continues to earn regular plaudits from industry publications for his courtroom achievements.

As vice chair of the IP Litigation Practice Group, Mary (Mindy) Sooter plays a central role in the firm’s most significant patent matters. She advises leading medical device, telecommunications and technology companies and is particularly valued for her ability to translate highly technical engineering concepts into clear, persuasive narratives for judges and juries.

Partner Kevin Prussia is described by peers as a “very capable advocate”. A member of the firm’s Management Committee, he represents life sciences and technology companies in major patent disputes across trial and appellate proceedings, federal bench and jury trials, International Trade Commission (ITC) investigations, Patent Trial and Appeal Board (PTAB) proceedings and appeals before the US Court of Appeals for the Federal Circuit.

Key matters:

• Masimo v Apple

WilmerHale’s Mark Selwyn and Joseph Mueller were among those on the team for Apple in its high-profile clash with Masimo.

In November 2025, a federal jury found Apple had infringed Masimo’s pulse oximetry patent and awarded $634 million in damages. Apple is expected to appeal the decision.

Clients:

Clients:  Apple, Cisco, Intel, Natera, Roche