William B. Nash

William B. ("Bill") Nash is a partner in Haynes Boone's Intellectual Property Litigation Practice in the firm's San Antonio and Dallas offices. Bill is a registered patent attorney and litigator with more than 30 years of extensive national and international experience in intellectual property.

As a litigator, Bill protects his clients' rights and is often called upon in critical company litigation. He has handled major patent infringement, trademark infringement, copyright infringement, unfair competition, and trade secret cases in jurisdictions from California to Massachusetts, including the U.S. International Trade Commission (ITC) in Washington, D.C., in addition to those filed in the four federal districts within Texas. As an intellectual property advisor, he has broad experience in infringement and validity opinions, and he regularly helps clients develop strategies to avoid or minimize litigation risks. Bill works closely with his clients to protect, develop, commercialize, and license a company's IP assets, both in the U.S. and internationally. He has been responsible for more than 4,000 trademark filings around the world and has been lead attorney on more than 100 proceedings before the Trademark Trial and Appeal Board.

Bill is AV® Peer Review Rated Preeminent by Martindale-Hubbell® Law Directory and was recognized by World Trademark Review's WTR 1000, Globe Business Publishing, Ltd.in 2017-2025. Bill was recognized in Best Lawyers in America, Woodward/White, Inc., for Litigation - Patent, 2019-2025, and recognized by Best Lawyers as a "Lawyer of the Year," Woodward/White, Inc., 2023. Additionally, Bill was recognized by San Antonio Scene, Scene Monthly LLC, in Best San Antonio Lawyers for Intellectual Property Litigation, 2015. He also received the Outstanding Lawyer Award by San Antonio Business Journal, American City Business Journals, in 2016.