Mrs. Mary Marshall was a pioneering physical medium in 19th-century England, renowned for her extraordinary public séances. She became a key figure in early spiritualism by demonstrating classic signs of physical mediumship—such as table levitations, spirit touches, and direct voices—often in well-lit rooms. Her bold approach to mediumship challenged skeptics and helped define the standards by which physical phenomena were evaluated. As a foundational figure in the history of physical mediums, Marshall’s contributions continue to influence modern investigations into spirit communication.