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Dr. Matthew W. Johnson is a psychopharmacologist on the faculty of the Department of Psychiatry at the Johns Hopkins School of Medicine. His research background includes the use of behavioral and economic theory in the study of drug consumption, self-control, and addiction, and the study of psychoactive drug effects in human participants.  His human drug administration studies have examined psilocybin, GHB, cocaine, sedative/hypnotics, alcohol, nicotine, and caffeine.  Since 2004, as a member of the Johns Hopkins Psilocybin Research Project, Dr. Johnson has designed, implemented and analyzed psilocybin administration studies, and has monitored and supported participants through high dose psilocybin sessions.  Recently, he and colleagues authored two scientific papers on hallucinogens: one showing persisting spiritually-significant effects from psilocybin 14 months after administration, and the other providing guidelines for managing high-dose hallucinogen effects in scientific research.