Sidley Invests in IP Litigation With Addition of Partners Greg Lantier and Alexis Cohen in Further Expansion of Washington, D.C. Office

Washington, D.C. – Sidley is pleased to announce that Greg Lantier and Alexis Cohen have joined the firm’s Litigation practice as Intellectual Property partners in the firm’s office in Washington, D.C. Mr. Lantier and Ms. Cohen join from WilmerHale.

Mr. Lantier is a first-chair trial lawyer and experienced appellate advocate who focuses on disputes involving intellectual property, including utility patent, design patent, copyright, and trade secret infringement, as well as IP ownership and licensing lawsuits. He has served as lead counsel for clients from a broad range of industries in matters before the U.S. Supreme Court, U.S. Circuit Courts of Appeal, U.S. district courts, state courts, the U.S. Court of Federal Claims, the U.S. International Trade Commission, and in arbitration. Mr. Lantier also has a nationally recognized post-grant proceedings practice before the USPTO’s Patent Trial and Appeal Board (PTAB) where he has successfully represented petitioners and patent owners in dozens of inter partes review proceedings. In addition to his advocacy in contentious disputes, Mr. Lantier advises clients regarding intellectual property licensing and assists clients in connection with legislative and executive actions in Washington affecting intellectual property interests.

Ms. Cohen advises clients on complex intellectual property matters, with a focus on patent litigation, post-grant proceedings, and pre-litigation counseling. Ms. Cohen focuses her practice on the medical device and life sciences industries, and has worked with clients across a broad range of other fields, including software, telecommunications, technology, and materials science. She has represented clients before U.S. District Courts, the Federal Circuit, state courts, arbitration tribunals, and the PTAB. Ms. Cohen provides strategic advice to clients of various sizes, from start-ups to Fortune 100 corporations, to help build patent portfolios, defend against patent-related risks, craft litigation strategy, and analyze business decisions.

“We are excited about this trial team joining Sidley’s well regarded and consistently ranked practice, including a Tier 1 national ranking for IP in Benchmark Litigation 2026,” said Yvette Ostolaza, Sidley’s Management Committee Chair. “Their trial experience in bet-the-company patent and other appellate matters before courts spans numerous jurisdictions, which provides them the opportunity to work with litigators across our U.S. offices.”

“Greg and Alexis have relationships with clients across industries. With a focus on life science, financial institutions, and technology companies, among others, their client base closely aligns with our IP litigation group’s priorities,” said Kristin Graham Koehler, managing partner of Sidley’s Washington, D.C. office and a member of the firm’s Management Committee and Executive Committee. “Their clients will benefit from the broader capabilities of our transactional and regulatory practices as well.”

Mr. Lantier and Ms. Cohen are the ninth and tenth new partners to join Sidley’s Washington, D.C. office since the start of 2025. The Washington, D.C. office has also welcomed the following exceptionally talented lawyers: Paul Boehm, Maura Rezendes, John Foote, Barbara Stettner, Molly Lovedale, Alana Genderson, Michael Hochman, and Lisa Miller.

Sidley is “Built to Win®” at each stage of the litigation process and counts more than 750 litigators worldwide. With true geographic reach, the firm can field winning litigation teams in virtually any forum where its clients find themselves facing a dispute.

Sidley boasts one of the most distinguished and highly regarded intellectual property (IP) litigation practices in the United States, with approximately 80 lawyers and a deep bench of trial lawyers. Handling matters for innovation-driven clients of all sizes, from global Fortune 500 companies to groundbreaking startups, we develop winning strategies for high-stakes IP litigation involving patents, trade secret and unfair competition, false advertising, copyright infringement, and trademarks.

Sidley is an elite global law firm. With approximately 2,300 lawyers and 160 years of experience, we have established a reputation for deploying innovative legal strategies to achieve powerful results for our clients in complex transactional, restructuring, crisis management, investigation, regulatory, and litigation matters.

Our perspective and reach are truly global, supported by 21 offices strategically situated in key commercial, regulatory, and financial centers across the world. Our lawyers and business professionals, fluent in more than 75 languages, possess the cultural awareness and cross-border legal acumen needed to bring clarity to a dynamic business landscape.

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