 Although Elizabeth is not listed as Marston's collaborator in his early work, Lamb, Matte (1996), and others refer directly and indirectly to Elizabeth's own work on her husband's research.She also appears in a picture taken in his laboratory in the 1920s (reproduced by Marston, 1938).Marston set out to commercialize Larson's invention of the polygraph, when he subsequently embarked on a career in entertainment and comic book writing and appeared as a salesman in ads for Gillette Razors, using a polygraph motif.