Charles S. Grob, M.D., is Professor of Psychiatry and Pediatrics at the UCLA School of Medicine and Director of the Division of Child and Adolescent Psychiatry at Harbor-UCLA Medical Center. He conducted the first government-approved study of MDMA, and was the principal investigator of an international biomedical psychiatric research project in the Brazilian Amazon of the plant, ayahuasca. He is currently conducting an investigation of the effects of psilocybin on anxiety in cancer patients. Dr. Grob has published numerous articles in medical and psychiatric journals and collected volumes, and is the editor of Hallucinogens: A Reader. He is a founding board member of the Heffter Research Institute.