Sterne Kessler Building Interior

Gaby L. Longsworth, Ph.D.


Gaby L. Longsworth, Ph.D., is a director in Sterne Kessler's Biotechnology/Chemical Practice Group. Gaby is sought out by innovator and generic pharmaceutical companies world-wide for her insights and knowledge of intellectual property and Hatch-Waxman law.

Gaby counsels biopharmaceutical clients from around the world in all areas of patent procurement, including domestic and foreign patent preparation and lifecycle management strategies. Additionally, with her extensive generic pharmaceutical expertise, Gaby is uniquely qualified to evaluate innovator IP portfolios from a generic perspective, including method-of-use claim coverage relative to the product label, Orange Book patent listing strategies, Patent Term Extension, and data exclusivity.

In addition to biotech and pharma, Gaby also counsels clients on obtaining plant patents.

Beyond Gaby's extensive prosecution experience, she has rendered over a thousand invalidity, non-infringement, freedom-to-operate, and patentability opinions in the following areas among others: small molecules; polymorphs; crystal forms and salts; chemical synthesis; pharmaceutical formulations, including oral dosage forms and parenterals; transdermal patches; ophthalmics, creams, gels, suspensions, nasal and oral inhalation forms, pharmacokinetics, and therapeutic antibodies.

She is also involved in multiple Inter Partes Review (IPR) proceedings in front of the PTAB.

In addition to maintaining a vibrant practice, retaining and advancing female lawyers is important to Gaby. She is especially passionate about training and retaining lawyers, who are also moms, to be thought leaders in their fields. Gaby is one of the organizers of "INSPIRED by the Women of Sterne Kessler," an affinity group designed to engage female attorneys through participation in a variety of programs, seminars, book clubs, lunches, and other activities that support personal and professional development. She continually seeks innovative ways to address implicit gender stereotypes and has been published and served as a speaker/panelist on related topics and issues. Gaby has participated in several organizations that encourage the advancement and leadership of women in legal professions.

Gaby is a contributing author of Patent Office Litigation, Second Edition, published in 2017 by Thomson Reuters Westlaw. The book provides a fresh and comprehensive exploration of patent office litigation proceedings, including how the proceedings interact with other aspects of patent procurement and enforcement, while delivering practical analysis and advice.

Gaby earned a J.D. at Georgetown University Law Center, a Ph.D. in human genetics and molecular biology at The Johns Hopkins University and a B.S. in molecular biology from the Florida Institute of Technology. She is fluent in Dutch.


  • LMG Life Sciences, "Finalist - Patent Strategy and Management Attorney of the Year (District of Columbia) Category" (2017) 
  • LMG Life Sciences, "Life Sciences Star" (2017)

Thought Leadership

Contact Information

Phone Number


Georgetown University Law Center
Human Genetics and Molecular Biology
The Johns Hopkins University
Molecular Biology
Florida Institute of Technology


District of Columbia
Supreme Court of the United States
United States Patent & Trademark Office


  • American Intellectual Property Law Association 
  • BNAMedical Devices Law Industry Report, Advisory Board Member
  • Maryland State Bar Association, Intellectual Property Committee
  • National Association of Women Lawyers 
  • National Bar Association
  • Women's Bar Association of the District of Columbia

Languages Spoken