Sarah Elizabeth Marston ( Holloway; February 20, 1893 – March 27, 1993) was an American attorney and psychologist. She is credited, with her husband William Moulton Marston, with the development of the systolic blood pressure measurement used to detect deception; the predecessor to the polygraph. She is also credited as the inspiration for her husband's comic book creation Wonder Woman, a character fashioned on their polyamorous life partner, Olive Byrne. Early life Marston was born Sarah Elizabeth Holloway on the Isle of Man, to William George Washington Holloway (died February 13, 1961), an American bank clerk, and his English wife, Daisy ( De Gaunza; died July 19, 1945), who had married in England in 1892. After her family moved to the United States, Sarah was raised in Boston, Massachusetts. Her nickname was "Sadie". She eventually discarded her forename in favor of her middle name, Elizabeth, by which she would become known. Career and family Marston received her BA in psychology from Mount Holyoke College in 1915 and her LLB from the Boston University School of Law in 1918, one of just three female graduates of the School of Law that year. Marston married William Moulton Marston in 1915. She first gave birth at age 35, then returned to work. During her long and productive career, she indexed the documents of the first fourteen Congresses, lectured on law, ethics and psychology at several American universities, and served as an editor for Encyclopædia Britannica and McCall's. She cowrote a textbook, Integrative Psychology, with her husband and C. Daly King. In 1933, she became the assistant to the chief executive at Metropolitan Life Insurance. Sometime in the late 1920s, Olive Byrne, a young woman William had met while teaching at Tufts University, joined the household. Elizabeth Marston had two children, Peter and Olive Ann, while Olive Byrne also gave birth to two of William's children, Byrne and Donn. The Marstons legally adopted Olive's boys, and Olive remained a part of the family, even after William's death in 1947. Olive stayed home with the children while Marston worked. Continuing at MetLife until she was sixty-five, Elizabeth sponsored all four children through college — and Byrne through medical school and Donn through law school as well. She and Olive continued living together until Olive's death in 1990. Both Olive and Marston "embodied the feminism of the day." Systolic blood-pressure test Marston enrolled in the master's