David M. Krinsky

David M. Krinsky is a highly experienced litigator at Williams & Connolly LLP, specializing in patent and high-technology litigation. His practice encompasses a broad range of technical fields, including molecular biology, medicinal chemistry, software, telecommunications, and energy. With a background as a former software engineer, a significant portion of his work focuses on computer technology litigation, alongside extensive involvement in Hatch-Waxman pharmaceutical patent litigation.

Krinsky handles patent disputes for both plaintiffs and defendants, frequently representing operating companies. While tracked cases show plaintiff-side appearances, his firm profile indicates he has defended major software companies against patent infringement claims and served as lead counsel for defendants like Pfizer in significant patent litigation. He maintains an active appellate practice, having argued multiple appeals before the U.S. Court of Appeals for the Federal Circuit.

His notable representations include serving as lead counsel for Pfizer in IPR challenges against Moderna patents concerning its COVID-19 vaccine, which resulted in the invalidation of the asserted patents. He also secured summary judgment for Pfizer in a patent case related to its Paxlovid® product and achieved a Federal Circuit victory for Merck in ANDA litigation concerning Bridion® in March 2025. Krinsky has also acted as counsel for a biopharmaceutical company in a Hatch-Waxman bench trial and represented Bayer in a patent suit concerning recombinant DNA technology. He was recognized as a Law360 “MVP” in the Life Sciences category in November 2025 and a "Litigator of the Week Runner-Up" by The American Lawyer in March 2025.

Krinsky is a registered patent attorney and routinely appears before the Patent Trial and Appeal Board (PTAB) of the U.S. Patent and Trademark Office in inter partes review (IPR) proceedings. He has served as lead counsel in numerous IPRs for clients in both the software and pharmaceutical industries, including representing Petroleum Geo-Services in IPRs concerning seismic surveying technology. He earned his A.B. in Physics, cum laude, from Harvard College in 1999 and his J.D., summa cum laude, from Georgetown University Law Center in 2005. He was admitted to legal practice in Washington D.C. in 2007.