Jacobo Grinberg-Zylberbaum

Jacobo Grinberg-Zylberbaum (born December 12, 1946), also known simply as Jacobo Grinberg, was a Mexican neurophysiologist and psychologist who made studies of the human brain during such activities as witchcraft and shamanic practice, telepathy, and meditation at the National Autonomous University of Mexico (Universidad Nacional Autónoma de México, UNAM) and National Institute for the Study of Consciousness (Instituto Nacional Para el Estudio de la Conciencia, INPEC), authoring dozens of books and developing his Sintergy Theory (Teoría Sintérgica). Grinberg's last known appearance in public was 8 December 1994, and he has been considered to be a missing person since that time.