Lasso of Truth period before, during and after World War I, on understanding and perfecting the systolic blood-pressure test while working on his Ph.D. in psychology at Harvard University. Blood pressure was one of several elements measured in the polygraph tests that were being perfected since as far back as Italian criminologist Cesare Lombroso, in 1895. Marston's wife, psychologist and lawyer Elizabeth Holloway Marston, one of his inspirations for the Wonder Woman character, also played a key role in his lie detector research. But the lie detector had nothing to do with Marston's creation of the Magic Lasso. Wonder Woman's "Magic Lasso" or
Elizabeth Holloway Marston the polygraph test. In 1921, William received his PhD from Harvard and Marston her MA from Radcliffe. Although Marston is not listed as William's collaborator in his early work, a number of writers refer directly and indirectly to Elizabeth's work on her husband's deception research. She appears in a picture taken in his polygraph laboratory in the 1920s, reproduced in a 1938 publication by William. Marston's career included indexing "the documents of the first fourteen Congresses, lectur[ing] on law, ethics, and psychology at American and New York Universities, [and] serv[ing] as an editor for "Encyclopædia Britannica" and "McCall's". In 1933,