the secretary-treasurer and director of the organization from 1907–1920. Hyslop's first book on psychical research, Science and a Future Life, was published in 1905, and many more followed, including Enigmas of Psychic Research (1906), Borderland of Psychical Research (1906), Psychical Research and the Resurrection (1908), Psychical Research and Survival (1913), Life After Death (1918), and Contact with the Other World (1919). He wrote for the Journal and Proceedings of the ASPR and the SPR and for such publications as Mind, The Philosophical Review, and The Nation. He became convinced in the existence of an afterlife. Mental mediumship Originally an agnostic and materialist, Hyslop's interest in psychic investigation increased after sessions with the Boston medium Leonora Piper, whom he first met as early as 1888. Hyslop's first major experimental account of personal settings he had with Mrs. Piper was published in 1901 in the English proceedings. The issue as he saw it in this report was whether spiritism or telepathy exclusively from living people was the most rational explanation for the piper phenomenon, in particular, messages allegedly received from his deceased relatives. He concluded his lengthy account by saying that these messages forced him to ”give my adhesion to the theory that there is a future life and persistence of personal identity.... [and] to tolerate the spiritistic theory as rationally possible and respectable, as against stretching telepathy and its adjuncts into infinity and omniscience.” He believed that through her he had received messages from his father, his wife, and other members of his family, about which he reported in the Journal of the Society for Psychical Research (London, 1901). In his book Science and a Future Life (1905), Hyslop wrote of his séance sittings with the medium Leonora Piper and suggested they could only be explained by spirits or telepathy. Hyslop favoured the spiritualist hypothesis. However, Frank Podmore wrote that Hyslop's séance sittings with Piper "do not obviously call for any supernormal explanation" and "I cannot point to a single instance in which a precise and unambiguous piece of information has been furnished of a kind which could not have proceeded from the medium's own mind, working upon the materials provided and the hints let drop by the sitter." Beginning in 1907, he worked with different mediums to investigate spirit possession and obsession. He made a deep study of multiple personalities and of obsession, and came to the conclusion that in