Greg DeLassus—a senior associate focusing on patent prosecution—helps clients define, articulate, and legally protect their innovations in jurisdictions around the world. He has demonstrated expertise in all aspects of intellectual property law, including patent prosecution, trademark portfolio management, IP licensing, and litigation. Greg has worked as both an outside counsel and an in-house counsel, where he has counseled clients in a wide range of technology spaces, especially in the pharmaceutical (both large and small molecule) and ag-tech industries.

Greg’s work is based on the exacting, precise, and demanding process of developing a strategically optimal definition of an innovation for which he is seeking patent protection. For him, patent prosecution means clearly laying out what the innovation is and how it operates in a manner that protects the value of the invention and the work of the inventors. It’s all about perfecting a statement that will afford maximum legal protection for a complex product, and in so doing, simultaneously defending the value that product provides.

A self-described techno-optimist and lover of science, Greg sees his role as supporting the application of science to solve progressively more significant, and complex, challenges encountered by real people. By making the client’s scientific enterprise economically sustainable, he empowers the development and promulgation of solutions. He is skilled at discerning the exact points of distinction that mark the advance of a new invention, and at helping clients understand and manage the process of maximizing the economic returns the advance provides.

Honors & Recognitions

St. Louis University Law Journal (2010)

Up-&-Coming Lawyer, Missouri Lawyers Weekly (2016)

Community & Professional

Licensing Executives Society

Association of Corporate Counsel


J.D., Saint Louis University School of Law (magna cum laude)

M.S., Microbiology, University of Michigan

B.A., Biology and Philosophy, Truman State University (summa cum laude)


  • French
  • Portuguese

Bar & Court Admissions

Bar Admissions

  • District of Columbia
  • California
  • Missouri
  • Pennsylvania
  • U.S. Patent and Trademark Office
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