Mary T. Hannon focuses on preparing and prosecuting patents for clients as a patent agent in a variety of industries specifically related to the chemical sciences. Her graduate education and background provide experience and knowledge in a broad range of technology areas, including applied spectroscopy, polymer sciences, electrochemistry, and formulation development.

Background and Credentials

Prior to joining Marshall Gerstein, Mary worked in the chemical manufacturing industry. Her work focused on developing end-use formulations for the agricultural and personal care markets, in addition to enhancing research and development initiatives. She collaborated cross-functionally to deepen customer relationships and drive top line growth of the business through sales and new product development.

Mary received her M.S. in analytical and physical chemistry, as well as a B.S. in chemistry, both from DePaul University. In addition, she serves as an adjunct professor at DePaul University, teaching undergraduate general and organic chemistry courses.


  • DePaul University (M.S., with distinction)
    • Analytical and Physical Chemistry
  • DePaul University (B.S., magna cum laude)
    • Chemistry

Bar Admissions

  • U.S. Patent and Trademark Office

Publications and Presentations

Community and Professional Involvement

  • Society of Cosmetic Chemists–Member
  • American Chemical Society–Member