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Mary Ann Marshall (1880-1963), also known as Mary M, was a Canadian medium. She is most notable for a photo depicting tissue coming out her nose with a picture of Authur Conan Doyle's face in it which she claimed was his spirit.
Little is known about Marshall; she was of Scottish and Irish parentage but later moved to Winnipeg, Canada after World War I where she joined the Hamilton mediumship group. Some websites seem to have confused the American medium Mary Marshall with another British medium with the same name who lived between 1842-1884.
Photographs taken at the séances with Marshall were taken from 1928-1933 by the surgeon, and parapsychologist Dr. Thomas Glendenning Hamilton (1873-1935). As a spiritualist, Hamilton believed that the photos were genuine evidence for spirits. However the photographs reveal that the ectoplasm of Marshall in her seances were made of cloth, tissue, and magazine cut outs of people.