Marcia Moore was an American astrologer and yoga teacher brought to national attention through Yoga, Youth, and Reincarnation by Jess Stearn in 1965. She became a proponent of the drug ketamine in her 1978 book, Journeys Into The Bright World, written together with her husband anesthesiologist Howard Alltounian. The book promoted the existential richness of the ketamine-induced dissociative experience, and the possibilities for using this drug in conjunction with Jungian psychotherapy.
In the winter of 1979, Moore disappeared. Her remains were found two years later in the woods near her home. It has been hypothesized that Moore had injected all the ketamine available to her on a winter night in the forest, became unconscious, and died of hypothermia. Her lower jaw was identified via dental records. Ann Rule has stated that Moore's skull had been found with a hole in it; one of her friends suspected it was a bullet hole, but investigators believed it may have happened due to the skull's exposure to the elements over two years. This information was not immediately published by investigators at the time of the discovery.
Marcia Moore was the sister of Robin Moore, author of The French Connection and The Green Berets.