When I was just starting out in my reading and research into esotericism (about age 20 and 21; 1978-79) one of the first peop-le I read (along with John White) was Charles Tart, whose books written from 1960 to the early 70s brought together different perspectives on altered states of consciousness. Now I would consider it all very tame, but at the time he helped open a whole new world for me
The following is from Wikipedia; GNU open source license
Dr. Charles T. Tart (born 1937) is a American psychologist and parapsychologist known for his psychological work on the nature of consciousness (particularly altered states of consciousness), as one of the founders of the field of transpersonal psychology, and for his research in scientific parapsychology. He earned his Ph. D. in psychology from the University of North Carolina at Chapel Hill in 1963
His first books books, Altered States of Consciousness (1969) and Transpersonal Psychologies (1975), became widely used texts that were instrumental in allowing these areas to become part of modern psychology.
He is a Core Faculty Member at the Institute of Transpersonal Psychology (Palo Alto, California) and a Senior Research Fellow of the Institute of Noetic Sciences (Sausalito, California), as well as Professor Emeritus of Psychology at the University of California, Davis, where he served for 28 years, and emeritus member of the Monroe Institute board of advisors. Tart was the holder of the Bigelow Chair of Consciousness Studies at the University of Nevada in Las Vegas and has served as a Visiting Professor in East-West Psychology at the California Institute of Integral Studies, as an Instructor in Psychiatry at the School of Medicine of the University of Virginia, and a consultant on government funded parapsychological research at the Stanford Research Institute (now known as SRI International).
He was also integral in the theorizing and construction of the automatic ESP testing device the ESPATEACHER machine that was built at the University of Virginia. He supports Joseph McMoneagle's remote viewing claims that McMoneagle has remote viewed into the past, present, and future and has predicted future events.
As well as a laboratory researcher, Tart has been a student of the Japanese martial art of Aikido (in which he holds a black belt), of meditation, of Gurdjieff's work, of Buddhism, and of other psychological and spiritual growth disciplines. His primary goal is to build bridges between the scientific and spiritual communities, and to help bring about a refinement and integration of Western and Eastern approaches for knowing the world and for personal and social growth.
Biographical information, as well as the text of many of Professor Tartís publications.
Interview with Charles Tart explores his research findings and personal conclusions about spirituality, meditation and transpersonal psychology.
Full text of selected articles by and about Tart
T.A.S.T.E - Online journal of transcendent experiences that scientists have reported.