Sarah Elizabeth Marston (née Holloway; February 20, 1893 – March 27, 1993)[1] 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.

[2][3] She is also credited as an inspiration for her husband's comic book creation Wonder Woman, along with their polyamorous life partner, Olive Byrne.

[2][4][5][6][7][8] 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 (née De Gaunza; died July 19, 1945), who had married in England in 1892.

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.

[2][4] Sometime in the late 1920s, Olive Byrne, a young woman William had met while teaching at Tufts University, joined the household.

She's 99 come Thursday [...] One dark night as the clouds of war hovered over Europe again, Mr. Marston consulted his wife and collaborator, also a psychologist.

[6]Her obituary also stated that she contributed to the development of Wonder Woman,[2][15] while Lillian S. Robinson argued that both Olive Byrne and Elizabeth were models for the character.