Jonathan Guynn

Jonathan Guynn’s practice is focused on complex commercial litigation, internal investigations, and white collar defense. He has represented clients in a broad range of industries, including aerospace, telecommunications, pharmaceutical, technology, financial services, medical device, beverage, and digital advertising.

Mr. Guynn has a wealth of complex litigation experience, with an emphasis on trade secret, antitrust, and securities litigation. He has participated in and managed many aspects of litigation, from case inception through resolution, including conducting motion practice, fact and expert discovery, taking and defending depositons, and examining witnesses at trial.

Mr. Guynn is also an active pro bono attorney. He recently prevailed in a trial, securing a permanent restraining order for a victim of domestic violence, as well as an order of full physical and legal custody of the victim’s young children.

Before joining Hueston Hennigan, Mr. Guynn served as a law clerk to the Honorable Kent Jordan of the United States Court of Appeals for the Third Circuit (2014-2015) and to the Honorable David Campbell of the United States District Court for the District of Arizona (2013-2014).He also worked as a judicial intern for the Honorable Thomas Griffith of the United States Court of Appeals for the D.C. Circuit.

Litigation Experience

GlaxoSmithKline v. Abbott Laboratories: Representing GlaxoSmithKline in a dispute involving allegations of anticompetitive, unfair, deceptive, and bad faith conduct related to pricing of HIV medications.

Altamar Brands, LLC v. Numero Ocho, Ltd.: Representing a brand manager and distributor of alcoholic spirits in a contract dispute against a U.K. entity.

Herrick v. Grindr, LLC et al.: Representing an interactive computer service provider in a cutting-edge Section 230 dispute involving allegations of third-party e-personation and digital harassment.

Pharmaceutical Company: Representing generics and speciality branded pharmaceutical company in nationwide litigation involving allegations of false advertising and deceptive business practices related to its sale of FDA-approved opioid analgesic medications.

BlackBerry Limited: Representing BlackBerry as a third-party intervenor in a FRAND dispute between TCL Communications and Ericsson.

Broadcom Corporation v. Space Exploration Technologies Corp.: Represented SpaceX in a dispute involving allegations of unfair competition and trade secret misappropriation.

Data Storage Company: Represented computer data storage company and one of the largest computer hard disk manufacturers in the world in a dispute involving allegations of anticompetitive conduct and bad faith breach of contract against a components supplier. Achieved resolution without filing suit.

Internal Investigations and White Collar Defense

Medical Device Company: Secured a declination letter for a Fortune 500 medical device manufacturer in criminal investigation concerning alleged violations of the Food, Drug & Cosmetic Act, including allegations of knowingly manufacturing adulterated and misbranded medical devices, and violations of the FDA’s Good Manufacturing Practices.

Executive Officer of Digital Advertising Company: Represented a business executive at a digital advertising and technology firm in connection with a multi-year investigation by the Securities and Exchange Commission and United States Attorney’s Office involving allegations of securities fraud.

City of Santa Monica: Independently investigated allegations of unethical conduct in the City of Santa Monica, prepared a Report and Recommendation of Best Practices, and drafted proposed legislation that was ultimately adopted.

Investment Advisor: Represented investment advisor in connection with a Securities and Exchange Commission investigation into third-party investment funds. No action was taken against the investment advisor.

Other Experience

Green Energy Company: Evaluated potential legal challenges to proposed legislation aimed at reducing emissions and fostering use of green technologies in the greater Los Angeles area.


Jonathan Guynn

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University of Virginia School of Law (J.D., 2013) Order of the Coif; Editorial Board, Virginia Law Review; Hardy C. Dillard Legal Writing Fellow

Brigham Young University (B.A. Economics and History, 2010) Phi Kappa Phi; cum laude


Hon. Kent A. Jordan U.S. Court of Appeals, Third Circuit, 2014

Hon. David G. Campbell U.S. District Court, District of Arizona, 2013


The Political Economy of Financial Rulemaking After Business Roundtable 99 Va. L. Rev. 641 (2013)



New York

United States Court of Appeals U.S. Court of Appeals, Third Circuit

United States District Court Central District of California