The late great Dr. Timothy Leary was engaged in a program of experiments with LSD and other psychedelic drugs at Harvard University until sensational national publicity unfairly concentrating on student interest in drugs led to the suspension of the experiments. Since then, Dr. Leary continued his work on exploring the human consciousness through the use of psychedelics until his death. Ralph Metzner's book, The Psychedelic Connection, uses Dr. Leary is research as an instructional manual that can be used to help those undergoing a psychedelic experience on how to achieve enlightenment while traveling through the various levels of consciousness resulting from the psychedelic experience.London researcher Karl Jansen, M.D., Ph.D., and Member of the Royal College of Psychiatrists, is the world's leading expert on ketamine. He has studied ketamine at every level: from photographing the receptors to which ketamine binds in the human brain, while earning his doctorate in clinical pharmacology at the University of Oxford, to publishing papers on his discovery of the similarities between ketamine's psychoactive effects and the near-death experience during his study of medicine in New Zealand. His book, Ketamine: Dreams and Realities, describes his research of psychedelic experiences with ketamine and its connection to the near-death experience.